@article{rastogi_frey_2021, title={Characterizing Fuel Use and Emission Hotspots for a Diesel-Operated Passenger Rail Service}, volume={7}, DOI={10.1021/acs.est.1c00273}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, publisher={American Chemical Society (ACS)}, author={Rastogi, Nikhil and Frey, H. Christopher}, year={2021}, month={Aug} }
 @article{hossain_frey_louie_lau_2021, title={Combined effects of increased O-3 and reduced NO2 concentrations on short-term air pollution health risks in Hong Kong}, volume={270}, ISBN={1873-6424}, DOI={10.1016/j.envpol.2020.116280}, journal={ENVIRONMENTAL POLLUTION}, author={Hossain, Md Shakhaoat and Frey, H. Christopher and Louie, Peter K. K. and Lau, Alexis K. H.}, year={2021} }
 @article{hossain_che_frey_lau_2021, title={Factors affecting variability in infiltration of ambient particle and gaseous pollutants into home at urban environment}, volume={206}, DOI={10.1016/j.buildenv.2021.108351}, journal={BUILDING AND ENVIRONMENT}, publisher={Elsevier BV}, author={Hossain, Md Shakhaoat and Che, Wenwei and Frey, H. Christopher and Lau, Alexis K. H.}, year={2021}, month={Dec}, pages={108351} }
 @article{yuan_frey_2021, title={Multi-scale evaluation of diesel commuter rail fuel use, emissions, and eco-driving}, volume={10}, DOI={10.1016/j.trd.2021.102995}, journal={TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT}, author={Yuan, Weichang and Frey, H. Christopher}, year={2021}, month={Oct} }
 @article{sandhu_frey_bartelt-hunt_jones_2021, title={Real-world activity, fuel use, and emissions of heavy-duty compressed natural gas refuse trucks}, volume={761}, ISBN={1879-1026}, DOI={10.1016/j.scitotenv.2020.143323}, journal={SCIENCE OF THE TOTAL ENVIRONMENT}, author={Sandhu, Gurdas S. and Frey, H. Christopher and Bartelt-Hunt, Shannon and Jones, Elizabeth}, year={2021} }
 @article{wei_frey_2021, title={Sensitivity of light duty vehicle tailpipe emission rates from simplified portable emission measurement systems to variation in engine volumetric efficiency}, volume={6}, DOI={10.1080/10962247.2021.1923586}, journal={JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION}, publisher={Informa UK Limited}, author={Wei, Tongchuan and Frey, H. Christopher}, year={2021}, month={Jun}, pages={1–21} }
 @article{wei_frey_2020, title={Evaluation of the Precision and Accuracy of Cycle-Average Light Duty Gasoline Vehicles Tailpipe Emission Rates Predicted by Modal Models}, ISBN={2169-4052}, DOI={10.1177/0361198120924006}, journal={TRANSPORTATION RESEARCH RECORD}, author={Wei, Tongchuan and Frey, H. Christopher}, year={2020} }
 @article{wei_frey_2020, title={Factors affecting variability in fossil-fueled transit bus emission rates}, volume={233}, ISBN={1873-2844}, DOI={10.1016/j.atmosenv.2020.117613}, journal={ATMOSPHERIC ENVIRONMENT}, author={Wei, Tongchuan and Frey, H. Christopher}, year={2020} }
 @article{khan_frey_rastogi_wei_2020, title={Geospatial Variation of Real-World Tailpipe Emission Rates for Light-Duty Gasoline Vehicles}, volume={54}, DOI={10.1021/acs.est.0c00489}, number={14}, journal={Environmental Science & Technology}, publisher={American Chemical Society (ACS)}, author={Khan, Tanzila and Frey, H. Christopher and Rastogi, Nikhil and Wei, Tongchuan}, year={2020}, month={Jul}, pages={8968–8979} }
 @article{che_frey_fung_ning_qu_lo_chen_wong_wong_lee_et al._2020, title={PRAISE -HK: A personalized real-time air quality informatics system for citizen participation in exposure and health risk management}, volume={54}, ISBN={2210-6715}, DOI={10.1016/j.scs.2019.101986}, journal={SUSTAINABLE CITIES AND SOCIETY}, author={Che, Wenwe and Frey, H. Christopher and Fung, Jimmy C. H. and Ning, Zhi and Qu, Huamin and Lo, Hong Kam and Chen, Lei and Wong, Tze-Wai and Wong, Michelle K. M. and Lee, Ophelia C. W. and et al.}, year={2020}, month={Mar} }
 @article{yuan_frey_2020, title={Potential for metro rail energy savings and emissions reduction via eco-driving}, volume={268}, ISBN={1872-9118}, DOI={10.1016/j.apenergy.2020.114944}, journal={APPLIED ENERGY}, author={Yuan, Weichang and Frey, H. Christopher}, year={2020} }
 @article{frey_gadre_singh_kumar_2020, title={Quantification of Sources of Variability of Air Pollutant Exposure Concentrations Among Selected Transportation Microenvironments}, ISBN={2169-4052}, DOI={10.1177/0361198120929336}, journal={TRANSPORTATION RESEARCH RECORD}, author={Frey, H. Christopher and Gadre, Disha and Singh, Sanjam and Kumar, Prashant}, year={2020} }
 @article{frey_zheng_hu_2020, title={Variability in Measured Real-World Operational Energy Use and Emission Rates of a Plug-In Hybrid Electric Vehicle}, DOI={10.3390/en13051140}, journal={Energies}, author={Frey, H. Christopher and Zheng, Xiaohui and Hu, Jiangchuan}, year={2020}, month={Mar} }
 @article{yuan_frey_wei_rastogi_vandergriend_miller_mattison_2019, title={Comparison of real-world vehicle fuel use and tailpipe emissions for gasoline-ethanol fuel blends}, volume={249}, ISBN={1873-7153}, DOI={10.1016/j.fuel.2019.03.115}, journal={FUEL}, author={Yuan, Weichang and Frey, H. Christopher and Wei, Tongchuan and Rastogi, Nikhil and VanderGriend, Steven and Miller, David and Mattison, Lawrence}, year={2019}, pages={352–364} }
 @article{khan_frey_2019, title={Effect of Air-Conditioning on Light Duty Gasoline Vehicles Fuel Economy}, volume={2673}, ISBN={2169-4052}, DOI={10.1177/0361198119838507}, number={5}, journal={TRANSPORTATION RESEARCH RECORD}, author={Khan, Tanzila and Frey, H. Christopher}, year={2019}, month={May}, pages={131–141} }
 @article{che_frey_li_lao_lau_2019, title={Indoor Exposure to Ambient Particles and Its Estimation Using Fixed Site Monitors}, volume={53}, DOI={10.1021/acs.est.8b04474}, number={2}, journal={Environmental Science & Technology}, publisher={American Chemical Society (ACS)}, author={Che, Wenwei and Frey, H. Christopher and Li, Zhiyuan and Lao, Xiangqian and Lau, Alexis K. H.}, year={2019}, month={Jan}, pages={808–819} }
 @article{yuan_frey_rastogi_2019, title={Quantification of Energy Saving Potential for A Passenger Train Based on Inter-Run Variability in Speed Trajectories}, volume={2673}, ISBN={2169-4052}, DOI={10.1177/0361198119838516}, number={5}, journal={TRANSPORTATION RESEARCH RECORD}, author={Yuan, Weichang and Frey, H. Christopher and Rastogi, Nikhil}, year={2019}, month={May}, pages={153–165} }
 @article{kumar_patton_durant_frey_2018, title={A review of factors impacting exposure to PM2.5, ultrafine particles and black carbon in Asian transport microenvironments}, volume={187}, ISSN={1352-2310}, url={http://dx.doi.org/10.1016/J.ATMOSENV.2018.05.046}, DOI={10.1016/J.ATMOSENV.2018.05.046}, journal={Atmospheric Environment}, publisher={Elsevier BV}, author={Kumar, Prashant and Patton, Allison P. and Durant, John L. and Frey, H. Christopher}, year={2018}, month={Aug}, pages={301–316} }
 @article{khan_frey_2018, title={Comparison of real-world and certification emission rates for light duty gasoline vehicles}, volume={622-623}, DOI={10.1016/j.scitotenv.2017.10.286}, journal={Science of The Total Environment}, publisher={Elsevier BV}, author={Khan, Tanzila and Frey, H. Christopher}, year={2018}, month={May}, pages={790–800} }
 @article{kumar_rivas_singh_ganesh_ananya_frey_2018, title={Dynamics of coarse and fine particle exposure in transport microenvironments}, volume={1}, ISBN={2397-3722}, DOI={10.1038/s41612-018-0023-y}, journal={NPJ CLIMATE AND ATMOSPHERIC SCIENCE}, author={Kumar, Prashant and Rivas, Ioar and Singh, Anant Pratap and Ganesh, Vikas Julius and Ananya, Monirupa and Frey, H. Christopher}, year={2018} }
 @article{tanvir_frey_rouphail_2018, title={Effect of Light Duty Vehicle Performance on a Driving Style Metric}, volume={2672}, ISBN={2169-4052}, DOI={10.1177/0361198118796070}, number={25}, journal={TRANSPORTATION RESEARCH RECORD}, author={Tanvir, Shams and Frey, H. Christopher and Rouphail, Nagui M.}, year={2018}, month={Dec}, pages={67–78} }
 @article{li_che_frey_lau_2018, title={Factors affecting variability in PM 2.5 exposure concentrations in a metro system}, volume={160}, ISSN={0013-9351}, url={http://dx.doi.org/10.1016/J.ENVRES.2017.09.006}, DOI={10.1016/J.ENVRES.2017.09.006}, journal={Environmental Research}, publisher={Elsevier BV}, author={Li, Zhiyuan and Che, Wenwei and Frey, H. Christopher and Lau, Alexis K.H.}, year={2018}, month={Jan}, pages={20–26} }
 @article{delavarrafiee_frey_2018, title={Real-world fuel use and gaseous emission rates for flex fuel vehicles operated on E85 versus gasoline}, volume={68}, DOI={10.1080/10962247.2017.1405097}, number={3}, journal={Journal of the Air & Waste Management Association}, publisher={Informa UK Limited}, author={Delavarrafiee, Maryam and Frey, H. Christopher}, year={2018}, month={Mar}, pages={235–254} }
 @article{altshuler_ayala_collet_chow_frey_shaikh_stevenson_walsh_watson_2018, title={Trends in on-road transportation, energy, and emissions}, volume={68}, DOI={10.1080/10962247.2018.1512734}, number={10}, journal={JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION}, author={Altshuler, Samuel L. and Ayala, Alberto and Collet, Susan and Chow, Judith C. and Frey, H. Christopher and Shaikh, Rashid and Stevenson, Eric D. and Walsh, Michael P. and Watson, John G.}, year={2018}, pages={1015–1024} }
 @article{frey_2018, title={Trends in onroad transportation energy and emissions}, volume={68}, DOI={10.1080/10962247.2018.1454357}, number={6}, journal={Journal of the Air & Waste Management Association}, publisher={Informa UK Limited}, author={Frey, H. Christopher}, year={2018}, month={Jun}, pages={514–563} }
 @article{li_che_frey_lau_lin_2017, title={Characterization of PM 2.5 exposure concentration in transport microenvironments using portable monitors}, volume={228}, DOI={10.1016/j.envpol.2017.05.039}, journal={Environmental Pollution}, publisher={Elsevier BV}, author={Li, Zhiyuan and Che, Wenwei and Frey, H. Christopher and Lau, Alexis K.H. and Lin, Changqing}, year={2017}, month={Sep}, pages={433–442} }
 @article{frey_delavarrafiee_singh_2017, title={Real-world freeway and ramp activity and emissions for light-duty gasoline vehicles}, DOI={10.3141/2627-03}, number={2627}, journal={Transportation Research Record}, author={Frey, H. Christopher and Delavarrafiee, M. and Singh, S.}, year={2017}, pages={17–25} }
 @article{hu_frey_washburn_2016, title={Comparison of vehicle-specific fuel use and emissions models based on externally and internally observable activity data}, DOI={10.3141/2570-04}, number={2570}, journal={Transportation Research Record}, author={Hu, J. C. and Frey, H. Christopher and Washburn, S. S.}, year={2016}, pages={30–38} }
 @article{frey_2016, title={Dose-response models are conditional on determination of causality}, volume={36}, DOI={10.1111/risa.12672}, number={9}, journal={Risk Analysis}, author={Frey, H. Christopher}, year={2016}, pages={1751–1754} }
 @article{graver_frey_hu_2016, title={Effect of biodiesel fuels on real-world emissions of passenger locomotives}, volume={50}, DOI={10.1021/acs.est.6b03567}, number={21}, journal={Environmental Science & Technology}, author={Graver, B. M. and Frey, H. Christopher and Hu, J. C.}, year={2016}, pages={12030–12039} }
 @article{khan_frey_2016, title={Evaluation of light-duty gasoline vehicle rated fuel economy based on in-use measurements}, DOI={10.3141/2570-03}, number={2570}, journal={Transportation Research Record}, author={Khan, Tanzila and Frey, H. Christopher}, year={2016}, pages={21–29} }
 @article{graver_frey_2016, title={Highway Vehicle Emissions Avoided by Diesel Passenger Rail Service Based on Real-World Data}, volume={2}, DOI={10.1007/s40864-016-0044-y}, number={3-4}, journal={Urban Rail Transit}, publisher={Springer Science and Business Media LLC}, author={Graver, Brandon M. and Frey, H. Christopher}, year={2016}, month={Dec}, pages={153–171} }
 @article{sandhu_frey_bartelt-hunt_jones_2016, title={Real-world activity, fuel use, and emissions of diesel side-loader refuse trucks}, volume={129}, DOI={10.1016/j.atmosenv.2016.01.014}, journal={Atmospheric Environment}, author={Sandhu, G. S. and Frey, H. Christopher and Bartelt-Hunt, S. and Jones, E.}, year={2016}, pages={98–104} }
 @article{che_frey_lau_2016, title={Sequential measurement of intermodal variability in public transportation PM2.5 and CO exposure concentrations}, volume={50}, DOI={10.1021/acs.est.6b01594}, number={16}, journal={Environmental Science & Technology}, author={Che, W. W. and Frey, H. Christopher and Lau, A. K. H.}, year={2016}, pages={8760–8769} }
 @article{graver_frey_2015, title={Comparison of over-the-rail and rail yard measurements of diesel locomotives}, volume={49}, DOI={10.1021/acs.est.5b02497}, number={21}, journal={Environmental Science & Technology}, author={Graver, B. M. and Frey, H. Christopher}, year={2015}, pages={13031–13039} }
 @article{che_frey_lau_2015, title={Comparison of sources of variability in school age children exposure to ambient PM2.5}, volume={49}, DOI={10.1021/es506275c}, number={3}, journal={Environmental Science & Technology}, author={Che, W. W. and Frey, H. Christopher and Lau, A. K. H.}, year={2015}, pages={1511–1520} }
 @article{sandhu_frey_bartelt-hunt_jones_2015, title={In-use activity, fuel use, and emissions of heavy-duty diesel roll-off refuse trucks}, volume={65}, DOI={10.1080/10962247.2014.990587}, number={3}, journal={Journal of the Air & Waste Management Association}, author={Sandhu, G. S. and Frey, H. Christopher and Bartelt-Hunt, S. and Jones, E.}, year={2015}, pages={306–323} }
 @article{zhou_tanvir_lei_taylor_liu_rouphail_frey_2015, title={Integrating a simplified emission estimation model and mesoscopic dynamic traffic simulator to efficiently evaluate emission impacts of traffic management strategies}, volume={37}, DOI={10.1016/j.trd.2015.04.013}, journal={Transportation Research. Part D, Transport and Environment}, author={Zhou, X. S. and Tanvir, S. and Lei, H. and Taylor, J. and Liu, B. and Rouphail, N. M. and Frey, H. Christopher}, year={2015}, pages={123–136} }
 @article{liu_frey_2015, title={Measurement and evaluation of real-world speed and acceleration activity envelopes for light-duty vehicles}, DOI={10.3141/2503-14}, number={2503}, journal={Transportation Research Record}, author={Liu, B. and Frey, H. Christopher}, year={2015}, pages={128–136} }
 @article{salamati_rouphail_frey_liu_schroeder_2015, title={Simplified method for comparing emissions in roundabouts and at signalized intersections}, number={2517}, journal={Transportation Research Record}, author={Salamati, K. and Rouphail, N. M. and Frey, H. C. and Liu, B. and Schroeder, B. J.}, year={2015}, pages={48–60} }
 @article{liu_frey_2015, title={Variability in light-duty gasoline vehicle emission factors from trip-based real-world measurements}, volume={49}, DOI={10.1021/acs.est.5b00553}, number={20}, journal={Environmental Science & Technology}, author={Liu, B. and Frey, H. Christopher}, year={2015}, pages={12525–12534} }
 @article{anya_rouphail_frey_schroeder_2014, title={Application of AIMSUN microsimulation model to estimate emissions on signalized arterial corridors}, number={2428}, journal={Transportation Research Record}, author={Anya, A. R. and Rouphail, N. M. and Frey, H. C. and Schroeder, B.}, year={2014}, pages={75–86} }
 @article{che_frey_lau_2014, title={Assessment of the effect of population and diary sampling methods on estimation of school-age children exposure to fine particles}, volume={34}, DOI={10.1111/risa.12238}, number={12}, journal={Risk Analysis}, author={Che, W. W. and Frey, H. Christopher and Lau, A. K. H.}, year={2014}, pages={2066–2079} }
 @article{jiao_frey_2014, title={Comparison of fine particulate matter and carbon monoxide exposure concentrations for selected transportation modes}, DOI={10.3141/2428-07}, number={2428}, journal={Transportation Research Record}, author={Jiao, W. and Frey, H. Christopher}, year={2014}, pages={54–62} }
 @article{sandhu_frey_bartelt-hunt_jones_2014, title={In-use measurement of the activity, fuel use, and emissions of front-loader refuse trucks}, volume={92}, DOI={10.1016/j.atmosenv.2014.04.036}, journal={Atmospheric Environment}, author={Sandhu, G. S. and Frey, H. Christopher and Bartelt-Hunt, S. and Jones, E.}, year={2014}, pages={557–565} }
 @article{hu_frey_sandhu_graver_bishop_schuchmann_ray_2014, title={Method for modeling driving cycles, fuel use, and emissions for over snow vehicles}, volume={48}, DOI={10.1021/es501164j}, number={14}, journal={Environmental Science & Technology}, author={Hu, J. C. and Frey, H. Christopher and Sandhu, G. S. and Graver, B. M. and Bishop, G. A. and Schuchmann, B. G. and Ray, J. D.}, year={2014}, pages={8258–8265} }
 @article{boroujeni_frey_2014, title={Road grade quantification based on global positioning system data obtained from real-world vehicle fuel use and emissions measurements}, volume={85}, DOI={10.1016/j.atmosenv.2013.12.025}, journal={Atmospheric Environment}, author={Boroujeni, B. Y. and Frey, H. Christopher}, year={2014}, pages={179–186} }
 @article{mannshardt_sucic_jiao_dominici_frey_reich_fuentes_2013, title={Comparing exposure metrics for the effects of fine particulate matter on emergency hospital admissions}, volume={23}, DOI={10.1038/jes.2013.39}, number={6}, journal={Journal of Exposure Science and Environmental Epidemiology}, author={Mannshardt, E. and Sucic, K. and Jiao, W. and Dominici, F. and Frey, H. Christopher and Reich, B. and Fuentes, M.}, year={2013}, pages={627–636} }
 @article{graver_frey_2013, title={Comparison of locomotive emissions measured during dynamometer versus rail yard engine load tests}, DOI={10.3141/2341-03}, number={2341}, journal={Transportation Research Record}, author={Graver, B. M. and Frey, H. Christopher}, year={2013}, pages={23–33} }
 @article{sandhu_frey_2013, title={Effects of errors on vehicle emission rates from portable emissions measurement systems}, number={2340}, journal={Transportation Research Record}, author={Sandhu, G. S. and Frey, H. C.}, year={2013}, pages={10–19} }
 @article{salamati_coelho_fernandes_rouphail_frey_bandeira_2013, title={Emissions estimation at multilane roundabouts effects of movement and approach lane}, number={2389}, journal={Transportation Research Record}, author={Salamati, K. and Coelho, M. C. and Fernandes, P. J. and Rouphail, N. M. and Frey, H. C. and Bandeira, J.}, year={2013}, pages={12–21} }
 @article{abolhasani_frey_2013, title={Engine and duty cycle variability in diesel construction equipment emissions}, volume={139}, DOI={10.1061/(asce)ee.1943-7870.0000548}, number={2}, journal={Journal of Environmental Engineering (United States)}, author={Abolhasani, S. and Frey, H. Christopher}, year={2013}, pages={261–268} }
 @article{jiao_frey_2013, title={Method for measuring the ratio of in-vehicle to near-vehicle exposure concentrations of airborne fine particles}, DOI={10.3141/2341-04}, number={2341}, journal={Transportation Research Record}, author={Jiao, W. and Frey, H. Christopher}, year={2013}, pages={34–42} }
 @article{boroujeni_frey_sandhu_2013, title={Road Grade Measurement Using In-Vehicle, Stand-Alone GPS with Barometric Altimeter}, volume={139}, DOI={10.1061/(asce)te.1943-5436.0000545}, number={6}, journal={Journal of Transportation Engineering}, author={Boroujeni, B. Y. and Frey, H. Christopher and Sandhu, G. S.}, year={2013}, pages={605–611} }
 @article{jiao_frey_cao_2012, title={Assessment of inter-individual, geographic, and seasonal variability in estimated human exposure to fine particles}, volume={46}, DOI={10.1021/es302803g}, number={22}, journal={Environmental Science and Technology}, author={Jiao, W. and Frey, H. Christopher and Cao, Y.}, year={2012}, pages={12519–12526} }
 @article{lewis_rasdorf_frey_leming_2012, title={Effects of engine idling on national ambient air quality standards criteria pollutant emissions from nonroad diesel construction equipment}, DOI={10.3141/2270-09}, number={2270}, journal={Transportation Research Record}, author={Lewis, P. and Rasdorf, W. and Frey, H. Christopher and Leming, M.}, year={2012}, pages={67–75} }
 @article{rasdorf_lewis_marshall_arocho_frey_2012, title={Evaluation of On-Site Fuel Use and Emissions over the Duration of a Commercial Building Project}, volume={18}, DOI={10.1061/(asce)is.1943-555x.0000071}, number={2}, journal={Journal of Infrastructure Systems}, author={Rasdorf, W. and Lewis, P. and Marshall, S.K. and Arocho, I. and Frey, H. Christopher}, year={2012}, pages={119–129} }
 @article{lee_frey_2012, title={Evaluation of representativeness of site-specific fuel-based vehicle emission factors for route average emissions}, volume={46}, DOI={10.1021/es204451z}, number={12}, journal={Environmental Science and Technology}, author={Lee, T. and Frey, H.C.}, year={2012}, pages={6867–6873} }
 @article{marshall_rasdorf_lewis_frey_2012, title={Methodology for estimating emissions inventories for commercial building projects}, volume={18}, DOI={10.1061/(ASCE)AE.1943-5568.0000073}, number={3}, journal={Journal of Architectural Engineering}, author={Marshall, S.K. and Rasdorf, W. and Lewis, P. and Frey, H.C.}, year={2012}, pages={251–260} }
 @article{cao_frey_2012, title={Modeling of Human Exposure to In-Vehicle PM2.5 from Environmental Tobacco Smoke}, volume={18}, DOI={10.1080/10807039.2012.672894}, number={3}, journal={Human and Ecological Risk Assessment}, author={Cao, Y. and Frey, H. Christopher}, year={2012}, pages={608–626} }
 @article{frey_choi_kim_2012, title={Portable emission measurement system for emissions of passenger rail locomotives}, DOI={10.3141/2289-08}, number={2289}, journal={Transportation Research Record}, author={Frey, H. Christopher and Choi, H.-W. and Kim, K.}, year={2012}, pages={56–63} }
 @article{sandhu_frey_2012, title={Real-world measurement and evaluation of duty cycles, fuels, and emission control technologies of heavy-duty trucks}, number={2270}, journal={Transportation Research Record}, author={Sandhu, G. S. and Frey, H. C.}, year={2012}, pages={180–187} }
 @article{chang_fuentes_frey_2012, title={Time series analysis of personal exposure to ambient air pollution and mortality using an exposure simulator}, volume={22}, DOI={10.1038/jes.2012.53}, number={5}, journal={Journal of Exposure Science and Environmental Epidemiology}, author={Chang, H.H. and Fuentes, M. and Frey, H. Christopher}, year={2012}, pages={483–488} }
 @article{lewis_leming_frey_rasdorf_2011, title={Assessing effects of operational efficiency on pollutant emissions of nonroad diesel construction equipment}, DOI={10.3141/2233-02}, number={2233}, journal={Transportation Research Record}, author={Lewis, P. and Leming, M. and Frey, H. Christopher and Rasdorf, W.}, year={2011}, pages={11–18} }
 @article{cao_frey_2011, title={Assessment of Interindividual and Geographic Variability in Human Exposure to Fine Particulate Matter in Environmental Tobacco Smoke}, volume={31}, DOI={10.1111/j.1539-6924.2010.01523.x}, number={4}, journal={Risk Analysis}, author={Cao, Y. and Frey, H.C.}, year={2011}, pages={578–591} }
 @article{liu_frey_2011, title={Comparison of driving schedule project level MOVES emission factors to empirical data}, volume={3}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Liu, B. and Frey, H.C.}, year={2011}, pages={2445–2454} }
 @article{sun_frey_2011, title={Comparison of real-world activity, fuel use, and emissions for selected light duty gasoline vehicles based on driving cycles}, volume={1}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Sun, Y. and Frey, H.C.}, year={2011}, pages={600–607} }
 @article{graver_frey_2011, title={Fuel use and emission rates for F59PH locomotive engines tested on an engine dynamometer}, volume={1}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Graver, B.M. and Frey, H.C.}, year={2011}, pages={614–619} }
 @article{cao_frey_2011, title={Geographic differences in inter-individual variability of human exposure to fine particulate matter}, volume={45}, DOI={10.1016/j.atmosenv.2011.07.034}, number={32}, journal={Atmospheric Environment}, author={Cao, Y. and Frey, H. Christopher}, year={2011}, pages={5684–5691} }
 @article{graver_frey_choi_2011, title={In-use measurement of activity, energy use, and emissions of a plug-in hybrid electric vehicle}, volume={45}, DOI={10.1021/es201165d}, number={20}, journal={Environmental Science and Technology}, author={Graver, B.M. and Frey, H. Christopher and Choi, H.-W.}, year={2011}, pages={9044–9051} }
 @article{frey_sandhu_sun_lee_swidan_liu_babaee_2011, title={Incorporating vehicle portable emissions measurement systems into the classroom}, volume={1}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Sandhu, G.S. and Sun, Y. and Lee, T. and Swidan, H. and Liu, B. and Babaee, S.}, year={2011}, pages={620–637} }
 @article{graver_frey_2011, title={Modeling of hybrid and plug-in hybrid electric vehicle energy use and emissions based on in-use measurement}, volume={1}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Graver, B.M. and Frey, H.C.}, year={2011}, pages={608–613} }
 @article{liu_frey_2011, title={Modeling of in-vehicle human exposure to ambient fine particulate matter}, volume={45}, DOI={10.1016/j.atmosenv.2011.04.019}, number={27}, journal={Atmospheric Environment}, author={Liu, X. and Frey, H. Christopher}, year={2011}, pages={4745–4752} }
 @article{lee_frey_2011, title={Variability in gram per gallon vehicle emission factors with engine load and among driving cycles}, volume={3}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Lee, T. and Frey, H.C.}, year={2011}, pages={2335–2341} }
 @article{frey_choi_graver_sandhu_2010, title={Comparative assessment of passenger railroad locomotives using portable emission measurement systems}, volume={7}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Choi, H.-W. and Graver, B.M. and Sandhu, G.S.}, year={2010}, pages={5249–5255} }
 @article{frey_rasdorf_lewis_2010, title={Comprehensive field study of fuel use and emissions of nonroad diesel construction equipment}, DOI={10.3141/2158-09}, number={2158}, journal={Transportation Research Record}, author={Frey, H. Christopher and Rasdorf, W. and Lewis, P.}, year={2010}, pages={69–76} }
 @article{choi_frey_2010, title={Estimating diesel vehicle emission factors at constant and high speeds for short road segments}, DOI={10.3141/2158-03}, number={2158}, journal={Transportation Research Record}, author={Choi, H.-W. and Frey, H. Christopher}, year={2010}, pages={19–27} }
 @article{liu_frey_cao_2010, title={Estimating in-vehicle concentration of and exposure to fine particulate matter: Near-roadway ambient air quality and variability in vehicle operation}, DOI={10.3141/2158-13}, number={2158}, journal={Transportation Research Record}, author={Liu, X. and Frey, H. Christopher and Cao, Y.}, year={2010}, pages={105–112} }
 @inproceedings{rasdorf_lewis_frey_2010, title={Estimating productivity-based fuel eifficiency and emissions factors of diesel construction equipment performing earthmoving activities}, ISBN={9781897911358}, booktitle={Proceedings of the 6th International Conference on Innovation in Architecture, Engineering, and Construction}, publisher={University Park, Pa. : Department of Architectural Engineering, Pennsylvania State University}, author={Rasdorf, W. and Lewis, P. and Frey, H. C.}, editor={Chimay J. Anumba, N. M. Bouchlaghem and John Messner and Parfitt, M.KevinEditors}, year={2010} }
 @article{rasdorf_frey_lewis_kim_pang_abolhassani_2010, title={Field procedures for real-world measurements of emissions from diesel construction vehicles}, volume={16}, DOI={10.1061/(asce)is.1943-555x.0000027}, number={3}, journal={Journal of Infrastructure Systems}, author={Rasdorf, W. and Frey, C. and Lewis, P. and Kim, K. and Pang, S.-H. and Abolhassani, S.}, year={2010}, pages={216–225} }
 @article{frey_choi_graver_sandhu_2010, title={Measurement and comparison of locomotive engine emissions}, volume={7}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Choi, H.-W. and Graver, B.M. and Sandhu, G.S.}, year={2010}, pages={5272–5280} }
 @article{choi_frey_2010, title={Method for in-use measurement and evaluation of the activity, fuel use, electricity use, and emissions of a plug-in hybrid diesel-electric school bus}, volume={44}, DOI={10.1021/es903330k}, number={9}, journal={Environmental Science and Technology}, author={Choi, H.-W. and Frey, H. Christopher}, year={2010}, pages={3601–3607} }
 @article{graver_frey_2010, title={Quantifying the microscale activity, energy use, and emissions of a plug-in hybrid electric vehicle based on in-use data}, volume={1}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Graver, B.M. and Frey, H.C.}, year={2010}, pages={23–45} }
 @article{frey_zhang_rouphail_2010, title={Vehicle-specific emissions modeling based upon on-road measurements}, volume={44}, DOI={10.1021/es902835h}, number={9}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zhang, K. and Rouphail, N.M.}, year={2010}, pages={3594–3600} }
 @article{frey_hubbell_2009, title={A risk-based assessment and management framework for multipollutant air quality}, volume={2}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Hubbell, B.}, year={2009}, pages={1068–1080} }
 @article{özkaynak_frey_burke_pinder_2009, title={Analysis of coupled model uncertainties in source-to-dose modeling of human exposures to ambient air pollution: A PM2.5 case study}, volume={43}, DOI={10.1016/j.atmosenv.2008.12.008}, number={9}, journal={Atmospheric Environment}, author={Özkaynak, H. and Frey, H. Christopher and Burke, J. and Pinder, R.W.}, year={2009}, pages={1641–1649} }
 @article{coelho_frey_rouphail_zhai_pelkmans_2009, title={Assessing methods for comparing emissions from gasoline and diesel light-duty vehicles based on microscale measurements}, volume={14}, DOI={10.1016/j.trd.2008.11.005}, number={2}, journal={Transportation Research Part D: Transport and Environment}, author={Coelho, M.C. and Frey, H. Christopher and Rouphail, N.M. and Zhai, H. and Pelkmans, L.}, year={2009}, pages={91–99} }
 @article{zhai_frey_rouphail_gonçalves_farias_2009, title={Comparison of flexible fuel vehicle and life-cycle fuel consumption and emissions of selected pollutants and greenhouse gases for ethanol 85 versus gasoline}, volume={59}, DOI={10.3155/1047-3289.59.8.912}, number={8}, journal={Journal of the Air and Waste Management Association}, author={Zhai, H. and Frey, H.C. and Rouphail, N.M. and Gonçalves, G.A. and Farias, T.L.}, year={2009}, pages={912–924} }
 @article{lewis_frey_rasdorf_2009, title={Development and use of emissions inventories for construction vehicles}, DOI={10.3141/2123-06}, number={2123}, journal={Transportation Research Record}, author={Lewis, P. and Frey, H. Christopher and Rasdorf, W.}, year={2009}, pages={46–53} }
 @article{frey_kuo_villa_2009, title={Effects of idle reduction technologies on real world fuel use and exhaust emissions of idling long-haul trucks}, volume={43}, DOI={10.1021/es900186e}, number={17}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Kuo, P.-Y. and Villa, C.}, year={2009}, pages={6875–6881} }
 @article{graver_frey_2009, title={Estimation of air carrier emissions at Raleigh-Durham international airport}, volume={4}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Graver, B.M. and Frey, H.C.}, year={2009}, pages={2502–2516} }
 @article{frey_choi_pritchard_lawrence_2009, title={In-use measurement of the activity, energy use, and emissions of a plug-in hybrid electric vehicle}, volume={2}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Choi, H.-W. and Pritchard, E. and Lawrence, J.}, year={2009}, pages={1127–1144} }
 @article{frey_kim_2009, title={In-use measurement of the activity, fuel use, and emissions of eight cement mixer trucks operated on each of petroleum diesel and soy-based B20 biodiesel}, volume={14}, DOI={10.1016/j.trd.2009.08.004}, number={8}, journal={Transportation Research Part D: Transport and Environment}, author={Frey, H. Christopher and Kim, K.}, year={2009}, pages={585–592} }
 @article{pang_frey_rasdorf_2009, title={Life cycle inventory energy consumption and emissions for biodiesel versus petroleum diesel fueled construction vehicles}, volume={43}, DOI={10.1021/os802916u}, number={16}, journal={Environmental Science & Technology}, author={Pang, S. H. and Frey, H. Christopher and Rasdorf, W. J.}, year={2009}, pages={6398–6405} }
 @article{pang_frey_rasdorf_2009, title={Life cycle inventory energy consumption and emissions for biodiesel versus petroleum diesel fueled construction vehicles}, volume={43}, DOI={10.1021/es802916u}, number={16}, journal={Environmental Science and Technology}, author={Pang, S.-H. and Frey, H.C. and Rasdorf, W.J.}, year={2009}, pages={6398–6405} }
 @article{choi_frey_2009, title={Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments}, volume={14}, DOI={10.1016/j.trd.2009.09.001}, number={8}, journal={Transportation Research. Part D, Transport and Environment}, author={Choi, H. W. and Frey, H. Christopher}, year={2009}, pages={610–614} }
 @article{frey_choi_kim_2009, title={Measurement of the energy use and emissions of passenger rail locomotives using a portable emission measurement system}, volume={2}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Choi, H.-W. and Kim, K.}, year={2009}, pages={1145–1157} }
 @article{liu_frey_cao_deshpande_2009, title={Modeling of in-vehicle PM2.5 exposure using the stochastic human exposure and dose simulation model}, volume={2}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Liu, X. and Frey, H.C. and Cao, Y. and Deshpande, B.}, year={2009}, pages={1087–1100} }
 @article{bogen_cullen_frey_price_2009, title={Probabilistic exposure analysis for chemical risk characterization}, volume={109}, DOI={10.1093/toxsci/kfp036}, number={1}, journal={Toxicological Sciences}, author={Bogen, K.T. and Cullen, A.C. and Frey, H. Christopher and Price, P.S.}, year={2009}, pages={4–17} }
 @article{frey_kuo_2009, title={Real-world energy use and emission rates for idling long-haul trucks and selected idle reduction technologies}, volume={59}, DOI={10.3155/1047-3289.59.7.857}, number={7}, journal={Journal of the Air and Waste Management Association}, author={Frey, H. Christopher and Kuo, P.-Y.}, year={2009}, pages={857–864} }
 @article{frey_zhai_rouphail_2009, title={Regional on-road vehicle running emissions modeling and evaluation for conventional and alternative vehicle technologies}, volume={43}, DOI={10.1021/es900535s}, number={21}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zhai, H. and Rouphail, N.M.}, year={2009}, pages={8449–8455} }
 @article{lewis_rasdorf_frey_pang_kim_2009, title={Requirements and incentives for reducing construction vehicle emissions and comparison of nonroad diesel engine emissions data sources}, volume={135}, DOI={10.1061/(ASCE)CO.1943-7862.0000008}, number={5}, journal={Journal of Construction Engineering and Management}, author={Lewis, P. and Rasdorf, W. and Frey, H. Christopher and Pang, S.-H. and Kim, K.}, year={2009}, pages={341–351} }
 @article{zhai_frey_rouphail_2008, title={A vehicle-specific power approach to speed- and facility-specific emissions estimates for diesel transit buses}, volume={42}, DOI={10.1021/es800208d}, number={21}, journal={Environmental Science and Technology}, author={Zhai, H. and Frey, H. Christopher and Rouphail, N.M.}, year={2008}, pages={7985–7991} }
 @article{frey_kim_pang_rasdorf_lewis_2008, title={Characterization of real-world activity, fuel use, and emissions for selected motor graders fueled with petroleum diesel and B20 biodiesel}, volume={58}, DOI={10.3155/1047-3289.58.10.1274}, number={10}, journal={Journal of the Air and Waste Management Association}, author={Frey, H. Christopher and Kim, K. and Pang, S.-H. and Rasdorf, W.J. and Lewis, P.}, year={2008}, pages={1274–1287} }
 @article{özkaynak_frey_hubbell_2008, title={Characterizing variability and uncertainty in exposure assessments improves links to environmental decision-making}, number={JULY}, journal={EM: Air and Waste Management Association's Magazine for Environmental Managers}, author={Özkaynak, H. and Frey, H.C. and Hubbell, B.}, year={2008}, pages={18–22} }
 @article{zhai_frey_rouphail_gonçalves_farias_2008, title={Comparison of fuel consumption and tailpipe emissions of ethanol 85 and gasoline for flexible fuel vehicles}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Zhai, H. and Frey, H.C. and Rouphail, N.M. and Gonçalves, G.A. and Farias, T.L.}, year={2008}, pages={3262–3276} }
 @article{frey_rasdorf_kim_pang_lewis_2008, title={Comparison of real-world emissions of B20 biodiesel versus petroleum diesel for selected IMonroad vehicles and engine tiers}, DOI={10.3141/2058-05}, number={2058}, journal={Transportation Research Record}, author={Frey, H. Christopher and Rasdorf, W. and Kim, K. and Pang, S.-H. and Lewis, P.}, year={2008}, pages={33–42} }
 @article{frey_choi_2008, title={Estimating light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments to support near-roadway air quality studies}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Choi, H.-W.}, year={2008}, pages={3137–3148} }
 @article{zhang_frey_2008, title={Evaluation of response time of a portable system for in-use vehicle tailpipe emissions measurement}, volume={42}, DOI={10.1021/es062999h}, number={1}, journal={Environmental Science and Technology}, author={Zhang, K. and Frey, C.}, year={2008}, pages={221–227} }
 @article{frey_zhang_rouphail_2008, title={Fuel use and emissions comparisons for alternative routes, time of day, road grade, and vehicles based on in-use measurements}, volume={42}, DOI={10.1021/es702493v}, number={7}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zhang, K. and Rouphail, N.M.}, year={2008}, pages={2483–2489} }
 @article{zhai_frey_rouphail_gonçalves_farias_2008, title={Impact of alternative vehicle technologies on measured vehicle emissions}, volume={320}, DOI={10.1061/40960(320)38}, journal={Transportation Land Use, Planning, and Air Quality - Proceedings of the 2007 Transportation Land Use, Planning, and Air Quality Conference}, author={Zhai, H. and Frey, H.C. and Rouphail, N.M. and Gonçalves, G.A. and Farias, T.L.}, year={2008} }
 @article{frey_rouphail_zhai_2008, title={Link-based emission factors for heavy-duty diesel trucks based on real-world data}, DOI={10.3141/2058-04}, number={2058}, journal={Transportation Research Record}, author={Frey, H. Christopher and Rouphail, N.M. and Zhai, H.}, year={2008}, pages={23–32} }
 @article{frey_kuo_villa_2008, title={Measurement and modeling of fuel use and exhaust emissions from idling Long-haul freight truck and auxiliary power unit engines}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Kuo, P.-Y. and Villa, C.}, year={2008}, pages={3060–3064} }
 @article{frey_kuo_villa_2008, title={Methodology for characterization of long-haul truck idling activity under real-world conditions}, volume={13}, DOI={10.1016/j.trd.2008.09.010}, number={8}, journal={Transportation Research Part D: Transport and Environment}, author={Frey, H. Christopher and Kuo, P.-Y. and Villa, C.}, year={2008}, pages={516–523} }
 @book{frey_rasdorf_kim_pang_lewis_abolhassani_2008, title={Real-world duty cycles and utilization for construction equipment in North Carolina}, number={FHWA/NC 2006-55}, journal={Technical Report- Not held in TRLN member libraries}, institution={Raleigh, N.C.:  North Carolina Department of Transportation}, author={Frey, H. C. and Rasdorf, W. and Kim, K. and Pang, S.-H. and Lewis, P. and Abolhassani, S.}, year={2008} }
 @article{abolhasani_frey_kim_rasdorf_lewis_pang_2008, title={Real-world in-use activity, fuel use, and emissions for nonroad construction vehicles: A case study for excavators}, volume={58}, DOI={10.3155/1047-3289.58.8.1033}, number={8}, journal={Journal of the Air and Waste Management Association}, author={Abolhasani, S. and Frey, H. Christopher and Kim, K. and Rasdorf, W. and Lewis, P. and Pang, S.-H.}, year={2008}, pages={1033–1046} }
 @article{frey_pang_kim_2008, title={Vehicle-specific emissions modeling for non-road construction vehicles based upon real-world measurements}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Pang, S.-H. and Kim, K.}, year={2008}, pages={2743–2749} }
 @article{frey_2008, title={What is uncertainty analysis and how can it be performed?}, volume={180}, DOI={10.1016/j.toxlet.2008.06.016}, journal={Toxicology Letters}, author={Frey, H.Christopher}, year={2008}, pages={3} }
 @article{frey_rouphail_zhai_farias_gonçalves_2007, title={Comparing real-world fuel consumption for diesel- and hydrogen-fueled transit buses and implication for emissions}, volume={12}, DOI={10.1016/j.trd.2007.03.003}, number={4}, journal={Transportation Research Part D: Transport and Environment}, author={Frey, H. Christopher and Rouphail, N.M. and Zhai, H. and Farias, T.L. and Gonçalves, G.A.}, year={2007}, pages={281–291} }
 @article{zhai_frey_rouphail_gonçalves_farias_2007, title={Fuel consumption and emissions comparisons between ethanol 85 and gasoline fuels for flexible fuel vehicles}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Zhai, H. and Frey, H.C. and Rouphail, N.M. and Gonçalves, G.A. and Farias, T.L.}, year={2007}, pages={3104–3108} }
 @book{frey_rasdorf_kim_pang_lewis_abolhassani_2007, title={Life cycle inventory and impact analysis framework for nonroad construction vehicles and equipment based upon in-use measurements}, journal={Technical Report- Not held in TRLN member libraries}, institution={Raleigh, N.C.:  National Science Foundation}, author={Frey, H. C. and Rasdorf, W. and Kim, K. and Pang, S.-H. and Lewis, P. and Abolhassani, S.}, year={2007} }
 @inproceedings{frey_rasdorf_pang_kim_abolhasani_lewis_2007, title={Methodology for activity, fuel use, and emissions data collection and analysis for nonroad construction equipment}, booktitle={Proceedings of the Air and Waste Management Association Annual Conference}, publisher={Pittsburgh, PA: AWMA}, author={Frey, H. C. and Rasdorf, W. and Pang, S. H. and Kim, K. and Abolhasani, S. and Lewis, P.}, year={2007} }
 @article{frey_rasdorf_pang_kim_abolhasani_lewis_2007, title={Methodology for activity, fuel use, and emissions data collection and analysis for nonroad construction equipment}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Rasdorf, W. and Pang, S.-H. and Kim, K. and Abolhasani, S. and Lewis, P.}, year={2007}, pages={3124–3128} }
 @inproceedings{frey_rasdorf_pang_kim_lewis_2007, title={Methods for measurement and analysis of in-use emissions of nonroad construction equipment}, booktitle={Proceedings of the EPA Emissions Inventory Conference}, publisher={Raleigh, NC: EPA}, author={Frey, H. C. and Rasdorf, W. and Pang, S. and Kim, K. and Lewis, P.}, year={2007} }
 @article{frey_kuo_2007, title={Potential best practices for reducing greenhouse gas (GHG) emissions in freight transportation}, volume={5}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Kuo, P.-Y.}, year={2007}, pages={3099–3103} }
 @article{vicari_mokhtari_morales_jaykus_frey_slenning_cowen_2007, title={Second-order modeling of variability and uncertainty in microbial hazard characterization}, volume={70}, DOI={10.4315/0362-028X-70.2.363}, number={2}, journal={Journal of Food Protection}, author={Vicari, A.S. and Mokhtari, A. and Morales, R.A. and Jaykus, L.-A. and Frey, H.C. and Slenning, B.D. and Cowen, P.}, year={2007}, pages={363–372} }
 @article{zhu_frey_2007, title={Simplified performance model of gas turbine combined cycle systems}, volume={133}, DOI={10.1061/(asce)0733-9402(2007)133:2(82)}, number={2}, journal={Journal of Energy Engineering}, author={Zhu, Y. and Frey, H. Christopher}, year={2007}, pages={82–90} }
 @article{frey_zhang_2007, title={Spatial and temporal analysis of real-world empirical fuel use and emissions}, volume={3}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Zhang, K.}, year={2007}, pages={2097–2102} }
 @article{miller_hidy_hales_kolb_werner_haneke_parrish_frey_rojas-bracho_deslauriers_et al._2006, title={Air emission inventories in North America: A critical assessment}, volume={56}, DOI={10.1080/10473289.2006.10464540}, number={8}, journal={Journal of the Air & Waste Management Association}, author={Miller, C. A. and Hidy, G. and Hales, J. and Kolb, C. E. and Werner, A. S. and Haneke, B. and Parrish, D. and Frey, H. C. and Rojas-Bracho, L. and Deslauriers, M. and et al.}, year={2006}, pages={1115–1129} }
 @article{miller_hidy_hales_kolb_werner_haneke_parrish_frey_rojas-bracho_deslauriers_et al._2006, title={Air emission inventories in North America: A critical assessment}, volume={56}, number={8}, journal={Journal of the Air and Waste Management Association}, author={Miller, C.A. and Hidy, G. and Hales, J. and Kolb, C.E. and Werner, A.S. and Haneke, B. and Parrish, D. and Frey, H.C. and Rojas-Bracho, L. and Deslauriers, M. and et al.}, year={2006}, pages={1115–1129} }
 @article{mokhtari_frey_jaykus_2006, title={Application of classification and regression trees for sensitivity analysis of the Escherichia coli O157:H7 food safety process risk model}, volume={69}, DOI={10.4315/0362-028X-69.3.609}, number={3}, journal={Journal of Food Protection}, author={Mokhtari, A. and Frey, H.C. and Jaykus, L.-A.}, year={2006}, pages={609–618} }
 @article{zietsman_perkinson_frey_wieters_2006, title={Emissions comparison between dirt roads and paved roads using portable emissions measurement systems}, volume={6}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Zietsman, J. and Perkinson, D.G. and Frey, H.C. and Wieters, K.M.}, year={2006}, pages={3421–3439} }
 @article{mokhtari_frey_zheng_2006, title={Evaluation and recommendation of sensitivity analysis methods for application to stochastic human exposure and dose simulation models}, volume={16}, DOI={10.1038/sj.jes.7500472}, number={6}, journal={Journal of Exposure Science and Environmental Epidemiology}, author={Mokhtari, A. and Frey, H. Christopher and Zheng, J.}, year={2006}, pages={491–506} }
 @article{silva_farias_frey_rouphail_2006, title={Evaluation of numerical models for simulation of real-world hot-stabilized fuel consumption and emissions of gasoline light-duty vehicles}, volume={11}, DOI={10.1016/j.trd.2006.07.004}, number={5}, journal={Transportation Research Part D: Transport and Environment}, author={Silva, C.M. and Farias, T.L. and Frey, H. Christopher and Rouphail, N.M.}, year={2006}, pages={377–385} }
 @article{mokhtari_frey_2006, title={Evaluation of sampling-based methods for sensitivity analysis: Case study for the E. coli food safety process risk model}, volume={12}, DOI={10.1080/10807030600977251}, number={6}, journal={Human and Ecological Risk Assessment}, author={Mokhtari, A. and Frey, H. Christopher}, year={2006}, pages={1128–1152} }
 @article{frey_zhu_2006, title={Improved system integration for integrated gasification combined cycle (IGCC) systems}, volume={40}, DOI={10.1021/es0515598}, number={5}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zhu, Y.}, year={2006}, pages={1693–1699} }
 @article{kim_abolhasani_pang_frey_2006, title={Real-world data collection procedure for non-road construction equipment: Problems, solutions, and data quality assurance}, volume={3}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Kim, K. and Abolhasani, S. and Pang, S.-H. and Frey, H.C.}, year={2006}, pages={1935–1939} }
 @article{zhang_frey_2006, title={Road grade estimation for on-road vehicle emissions modeling using light detection and ranging data}, volume={56}, DOI={10.1080/10473289.2006.10464500}, number={6}, journal={Journal of the Air and Waste Management Association}, author={Zhang, K. and Frey, H.C.}, year={2006}, pages={777–788} }
 @article{zhu_frey_2006, title={Uncertainty analysis of integrated gasification combined cycle systems based on frame 7H versus 7F gas turbines}, volume={56}, DOI={10.1080/10473289.2006.10464570}, number={12}, journal={Journal of the Air and Waste Management Association}, author={Zhu, Y. and Frey, H.C.}, year={2006}, pages={1649–1661} }
 @article{zhao_frey_2006, title={Uncertainty for data with non-detects: Air toxic emissions from combustion}, volume={12}, DOI={10.1080/10807030600977178}, number={6}, journal={Human and Ecological Risk Assessment}, author={Zhao, Y. and Frey, H. Christopher}, year={2006}, pages={1171–1191} }
 @article{frey_kim_2005, title={In-use emissions of heavy duty diesel dump trucks on petroleum diesel and B20 biodiesel fuels}, volume={2005}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Frey, H.C. and Kim, K.}, year={2005} }
 @article{zheng_frey_2005, title={Quantitative analysis of variability and uncertainty with known measurement error: Methodology and case study}, volume={25}, DOI={10.1111/j.1539-6924.2005.00620.x}, number={3}, journal={Risk Analysis}, author={Zheng, J. and Frey, H. Christopher}, year={2005}, pages={663–675} }
 @article{mokhtari_frey_2005, title={Recommended practice regarding selection of sensitivity analysis methods applied to microbial food safety process risk models}, volume={11}, DOI={10.1080/10807030590949672}, number={3}, journal={Human and Ecological Risk Assessment}, author={Mokhtari, A. and Frey, H. Christopher}, year={2005}, pages={591–605} }
 @article{zhang_frey_2005, title={Road grade estimation for on-road vehicle emissions modeling using lidar data}, volume={2005}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Zhang, K. and Frey, C.}, year={2005} }
 @article{mokhtari_frey_2005, title={Sensitivity analysis of a two-dimensional probabilistic risk assessment model using analysis of variance}, volume={25}, DOI={10.1111/j.1539-6924.2005.00679.x}, number={6}, journal={Risk Analysis}, author={Mokhtari, A. and Frey, H. Christopher}, year={2005}, pages={1511–1529} }
 @article{hanna_heinold_paine_frey_baker_karp_feldman_2004, title={A Monte Carlo study of the uncertainties in predictions by ISC3ST and AERMOD of annual average benzene and 1,3-butadiene concentrations around the Houston Ship Channel}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Hanna, S.R. and Heinold, D. and Paine, R. and Frey, H.C. and Baker, D. and Karp, R. and Feldman, H.}, year={2004}, pages={3145–3157} }
 @article{hanna_vukovich_arunachalam_loughlin_frey_isakov_2004, title={Assessment of uncertainty in benzene concentration estimates in the Houston, TX, area}, journal={Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA}, author={Hanna, A.F. and Vukovich, J.M. and Arunachalam, S. and Loughlin, D. and Frey, H.C. and Isakov, V.}, year={2004} }
 @article{patil_frey_2004, title={Comparison of sensitivity analysis methods based on applications to a food safety risk assessment model}, volume={24}, DOI={10.1111/j.0272-4332.2004.00460.x}, number={3}, journal={Risk Analysis}, author={Patil, S.R. and Frey, H. Christopher}, year={2004}, pages={573–585} }
 @article{zhao_frey_2004, title={Development of probabilistic emission inventories of air toxics for Jacksonville, Florida}, volume={54}, DOI={10.1080/10473289.2004.10471002}, number={11}, journal={Journal of the Air and Waste Management Association}, author={Zhao, Y. C. and Frey, H. Christopher}, year={2004}, pages={1405–1421} }
 @article{chen_frey_2004, title={Optimization under variability and uncertainty: A case study for NO x emissions control for a gasification system}, volume={38}, DOI={10.1021/es0351037}, number={24}, journal={Environmental Science and Technology}, author={Chen, J. and Frey, H. Christopher}, year={2004}, pages={6741–6747} }
 @article{abdel-aziz_frey_2004, title={Propagation of Uncertainty in Hourly Utility NOx Emissions through a Photochemical Grid Air Quality Model: A Case Study for the Charlotte, NC, Modeling Domain}, volume={38}, DOI={10.1021/es034062b}, number={7}, journal={Environmental Science and Technology}, author={Abdel-Aziz, A. and Frey, H. Christopher}, year={2004}, pages={2153–2160} }
 @article{unal_frey_rouphail_2004, title={Quantification of Highway Vehicle Emissions Hot Spots Based upon On-Board Measurements}, volume={54}, DOI={10.1080/10473289.2004.10470888}, number={2}, journal={Journal of the Air and Waste Management Association}, author={Unal, A. and Frey, H.C. and Rouphail, N.M.}, year={2004}, pages={130–140} }
 @article{frey_zhao_2004, title={Quantification of variability and uncertainty for air toxic emission inventories with censored emission factor data}, volume={38}, DOI={10.1021/es035096m}, number={22}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zhao, Y.}, year={2004}, pages={6094–6100} }
 @article{zhao_frey_2004, title={Quantification of variability and uncertainty for censored data sets and application to air toxic emission factors}, volume={24}, DOI={10.1111/j.0272-4332.2004.00504.x}, number={4}, journal={Risk Analysis}, author={Zhao, Y. and Frey, H. Christopher}, year={2004}, pages={1019–1034} }
 @article{zheng_frey_2004, title={Quantification of variability and uncertainty using mixture distributions: Evaluations of sample size, mixing weights, and separation between components}, volume={24}, DOI={10.1111/j.0272-4332.2004.00459.x}, number={3}, journal={Risk Analysis}, author={Zheng, J. and Frey, H. Christopher}, year={2004}, pages={553–571} }
 @article{abdel-aziz_frey_2003, title={Development of hourly probabilistic utility NOx emission inventories using time series techniques: Part I - Univariate approach}, volume={37}, DOI={10.1016/j.atmosenv.2003.09.007}, number={38}, journal={Atmospheric Environment}, author={Abdel-Aziz, A. and Frey, H. Christopher}, year={2003}, pages={5379–5389} }
 @article{abdel-aziz_frey_2003, title={Development of hourly probabilistic utility NOx emission inventories using time series techniques: Part II - Multivariate approach}, volume={37}, DOI={10.1016/j.atmosenv.2003.09.008}, number={38}, journal={Atmospheric Environment}, author={Abdel-Aziz, A. and Frey, H. Christopher}, year={2003}, pages={5391–5401} }
 @inbook{unal_rouphail_frey_2003, title={Effect of arterial signalization and level of service on measured vehicle emissions}, ISBN={0309085756}, number={1842}, booktitle={Energy, air quality, and fuels 2003}, publisher={Washington, DC: Transportation Research Board}, author={Unal, A. and Rouphail, N. M. and Frey, H. C.}, year={2003}, pages={47–56} }
 @article{unal_rouphail_frey_2003, title={Effect of arterial signalization and level of service on measured vehicle emissions}, number={1842}, journal={Transportation Research Record}, author={Unal, A. and Rouphail, N.M. and Frey, C.}, year={2003}, pages={47–56} }
 @article{frey_li_2003, title={Methods for Quantifying Variability and Uncertainty in AP-42 Emission Factors: Case Studies for Natural Gas-Fueled Engines}, volume={53}, DOI={10.1080/10473289.2003.10466317}, number={12}, journal={Journal of the Air and Waste Management Association}, author={Frey, H.C. and Li, S.}, year={2003}, pages={1436–1447} }
 @article{frey_unal_rouphail_colyar_2003, title={On-road measurement of vehicle tailpipe emissions using a portable instrument}, volume={53}, DOI={10.1080/10473289.2003.10466245}, number={8}, journal={Journal of the Air and Waste Management Association}, author={Frey, H.C. and Unal, A. and Rouphail, N.M. and Colyar, J.D.}, year={2003}, pages={992–1002} }
 @article{frey_bammi_2003, title={Probabilistic nonroad mobile source emission factors}, volume={129}, DOI={10.1061/(asce)0733-9372(2003)129:2(162)}, number={2}, journal={Journal of Environmental Engineering}, author={Frey, H. Christopher and Bammi, S.}, year={2003}, pages={162–168} }
 @article{abdel-aziz_frey_2003, title={Quantification of Hourly Variability in NOx Emissions for Baseload Coal-Fired Power Plants}, volume={53}, DOI={10.1080/10473289.2003.10466298}, number={11}, journal={Journal of the Air and Waste Management Association}, author={Abdel-Aziz, A. and Frey, H.C.}, year={2003}, pages={1401–1411} }
 @article{frey_patil_2002, title={Identification and review of sensitivity analysis methods}, volume={22}, DOI={10.1111/0272-4332.00039}, number={3}, journal={Risk Analysis}, author={Frey, H. Christopher and Patil, S.R.}, year={2002}, pages={553–578} }
 @article{frey_2002, title={Introduction to special section on sensitivity analysis and summary of NCSU/USDA workshop on sensitivity analysis}, volume={22}, DOI={10.1111/0272-4332.00037}, number={3}, journal={Risk Analysis}, author={Frey, H. Christopher}, year={2002}, pages={539–545} }
 @article{frey_zheng_2002, title={Probabilistic analysis of driving cycle-based highway vehicle emission factors}, volume={36}, DOI={10.1021/es0114308}, number={23}, journal={Environmental Science and Technology}, author={Frey, H. Christopher and Zheng, J.}, year={2002}, pages={5184–5191} }
 @article{frey_zheng_2002, title={Quantification of variability and uncertainty in air pollutant emission inventories: Method and case study for utility NOx emissions}, volume={52}, DOI={10.1080/10473289.2002.10470837}, number={9}, journal={Journal of the Air and Waste Management Association}, author={Frey, H.C. and Zheng, J.}, year={2002}, pages={1083–1095} }
 @article{frey_bammi_2002, title={Quantification of variability and uncertainty in lawn and garden equipment NOx and total hydrocarbon emission factors}, volume={52}, DOI={10.1080/10473289.2002.10470792}, number={4}, journal={Journal of the Air and Waste Management Association}, author={Frey, H.C. and Bammi, S.}, year={2002}, pages={435–448} }
 @article{hanna_lu_frey_wheeler_vukovich_arunachalam_fernau_hansen_2001, title={Uncertainties in predicted ozone concentrations due to input uncertainties for the UAM-V photochemical grid model applied to the July 1995 OTAG domain}, volume={35}, DOI={10.1016/S1352-2310(00)00367-8}, number={5}, journal={Atmospheric Environment}, author={Hanna, S.R. and Lu, Z. and Frey, H. Christopher and Wheeler, N. and Vukovich, J. and Arunachalam, S. and Fernau, M. and Hansen, D.A.}, year={2001}, pages={891–903} }
 @article{frey_burmaster_1999, title={Methods for characterizing variability and uncertainty: Comparison of bootstrap simulation and likelihood-based approaches}, volume={19}, DOI={10.1111/j.1539-6924.1999.tb00393.x}, number={1}, journal={Risk Analysis}, author={Frey, H. Christopher and Burmaster, D. E.}, year={1999}, pages={109–130} }
 @article{frey_burmaster_1999, title={Methods for characterizing variability and uncertainty: Comparison of bootstrap simulation and likelihood-based approaches}, volume={19}, DOI={10.1023/A:1006962412150}, number={1}, journal={Risk Analysis}, author={Frey, H.C. and Burmaster, D.E.}, year={1999}, pages={109–130} }
 @article{frey_rhodes_1998, title={Characterization and simulation of uncertain frequency distributions: Effects of distribution choice, variability, uncertainty, and parameter dependence}, volume={4}, DOI={10.1080/10807039891284406}, number={2}, journal={Human and Ecological Risk Assessment}, author={Frey, H. Christopher and Rhodes, D. S.}, year={1998}, pages={423–468} }
 @inproceedings{frey_bharvirkar_1998, title={Desktop modeling of the performance, emissions, and cost of gasification systems}, volume={91}, number={1998 June}, booktitle={Proceedings of the Air & Waste Management Association's, 91th Annual Meeting & Exhibition: San Diego, California, June 14-18, 1998}, publisher={Pittsburgh, PA :; A & WMA}, author={Frey, H. C. and Bharvirkar, R.}, year={1998} }
 @article{frey_bharvirkar_1998, title={Desktop modeling of the performance, emissions, and cost of gasification systems}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher and Bharvirkar, Ranjit}, year={1998} }
 @inproceedings{frey_1998, title={Methods for quantitative analysis of variability and uncertainty in hazardous air pollutant emissions}, volume={91}, number={1998 June}, booktitle={Proceedings of the Air & Waste Management Association's, 91th Annual Meeting & Exhibition: San Diego, California, June 14-18, 1998}, publisher={Pittsburgh, PA :; A & WMA}, author={Frey, H. C.}, year={1998} }
 @article{frey_1998, title={Methods for quantitative analysis of variability and uncertainty in hazardous air pollutant emissions}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher}, year={1998} }
 @inbook{frey_1998, title={Quantitative analysis of variability and uncertainty in energy and environmental systems}, booktitle={Uncertainty modeling and analysis in civil engineering}, publisher={Boca Raton: CRC Press}, author={Frey, H. C.}, year={1998}, pages={381–423} }
 @article{frey_1997, title={Bootstrap methods for quantitative analysis of variability and uncertainty in exposure and risk assessment}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher}, year={1997} }
 @article{rubin_kalagnanam_frey_berkenpas_1997, title={Integrated environmental control modeling of coal-fired power systems}, volume={47}, DOI={10.1080/10473289.1997.10464063}, number={11}, journal={Journal of the Air and Waste Management Association}, author={Rubin, E.S. and Kalagnanam, J.R. and Frey, H.C. and Berkenpas, M.B.}, year={1997}, pages={1180–1188} }
 @inproceedings{frey_iwanski_1997, title={Methods for characterizing and managing technological risks in advanced power generation systems: Application to gasification repowering in Poland}, number={1997 Oct.}, booktitle={Proceedings of Gasification Technologies Conference, Electric Power Research lnstitute, Palo Alto, CA. October 1997}, author={Frey, H. C. and Iwanski, Z.}, year={1997} }
 @article{agarwal_frey_1997, title={Modeling and evaluation of externally fired combined cycle using ASPEN}, volume={123}, DOI={10.1061/(ASCE)0733-9402(1997)123:3(69)}, number={3}, journal={Journal of Energy Engineering}, author={Agarwal, P. and Frey, H. Christopher}, year={1997}, pages={69–87} }
 @article{agrawal_frey_1997, title={Modeling and evaluation of externally fired combined cycle using ASPEN}, volume={123}, number={3}, journal={Journal of Energy Engineering}, author={Agrawal, P. and Frey, H.C.}, year={1997}, pages={69–86} }
 @article{diwekar_rubin_frey_1997, title={Optimal design of advanced power systems under uncertainty}, volume={38}, DOI={10.1016/S0196-8904(96)00184-7}, number={15-17}, journal={Energy Conversion and Management}, author={Diwekar, U.M. and Rubin, E.S. and Frey, H.C.}, year={1997}, pages={1725–1735} }
 @book{kini_frey_1997, title={Probabilistic evaluation of mobile source air pollution. Volume I, Probabilistic modeling of exhaust emissions from light duty gasoline vehicles}, publisher={Raleigh, NC: North Carolina State University for Center for Transportation and the Environment}, author={Kini, M. D. and Frey, H. C.}, year={1997} }
 @inproceedings{frey_iwanski_1997, title={Probabilistic methodology for risk assessment of new energy technologies and application to gasification repowering for an oil refinery in Poland}, volume={39}, number={16/18}, booktitle={Florence World Energy Research Symposium (1997): FLOWERS ''97: Florence World Energy Symposium}, publisher={Padova, Italy: SGEditorial}, author={Frey, H. C. and Iwanski, Z.}, editor={G. Manfrida and Lior, N.Editors}, year={1997}, pages={267–274} }
 @article{frey_1997, title={Quantification of uncertainty in remotesensing-based school bus CO and hydrocarbon emission factors}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher}, year={1997} }
 @inproceedings{rhodes_frey_1997, title={Quantification of variability and uncertainty in AP-42 emission factors using bootstrap simulation}, number={1997 Oct.}, booktitle={Emission inventory: Planning for the future, proceedings of a specialty conference, October 28-30, 1997, Research Triangle Park, NC}, publisher={Pittsburgh, Pa.: Air & Waste Management Association}, author={Rhodes, D. S. and Frey, H. C.}, year={1997} }
 @inbook{frey_rubin_1997, title={Uncertainty evaluation in capital cost projection}, volume={59}, booktitle={Encyclopedia of chemical processing and design, Vol. 59}, publisher={New York: Marcel Dekker}, author={Frey, H. C. and Rubin, E. S.}, year={1997}, pages={480–494} }
 @inproceedings{frey_1997, title={Variability and uncertainty in highway vehicle emission factors}, number={1997 Oct.}, booktitle={Emission inventory: Planning for the future, proceedings of a specialty conference, October 28-30, 1997, Research Triangle Park, NC}, publisher={Pittsburgh, Pa.: Air & Waste Management Association}, author={Frey, H. C.}, year={1997} }
 @article{frey_rhodes_1996, title={Characterizing, simulating, and analyzing variability and uncertainty: An illustration of methods using an air toxics emissions example}, volume={2}, number={4}, journal={Human and Ecological Risk Assessment (HERA)}, author={Frey, H.C. and Rhodes, D.S.}, year={1996}, pages={762–797} }
 @article{tran_frey_1996, title={Methods for evaluating the costs of utility NOx control technologies}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Tran, Loan K. and Frey, H.Christopher}, year={1996} }
 @article{diwekar_rubin_frey_1996, title={Optimization of environmental control system design for an IGCC power plant}, volume={1}, journal={Proceedings of the American Power Conference}, author={Diwekar, Urmila M. and Rubin, Edward S. and Frey, H.Christopher}, year={1996}, pages={58–63} }
 @article{frey_agarwal_1996, title={Probabilistic analysis and optimization of new power generation technologies: a case study for the externally-fired combined cycle}, volume={1}, journal={Proceedings of the American Power Conference}, author={Frey, H.Christopher and Agarwal, Pankaj}, year={1996}, pages={52–57} }
 @article{frey_agarwal_1996, title={Probabilistic modeling and optimization of clean coal technologies: case studies of the externally-fired combined cycle}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher and Agarwal, Pankaj}, year={1996} }
 @article{frey_kini_ranjithan_fu_1996, title={Uncertainty, bias, and variability in emission factors for light duty gasoline vehicles}, journal={Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition}, author={Frey, H.Christopher and Kini, Mitesh D. and Ranjithan, S.Ranji and Fu, Sing-Yih}, year={1996} }
 @article{shih_frey_1995, title={Coal blending optimization under uncertainty}, volume={83}, number={3}, journal={European Journal of Operational Research}, author={Shih, J.-S. and Frey, H.C.}, year={1995}, pages={452–465} }
 @article{frey_1995, title={Engineering-economic evaluation of SCR NOx control systems for coal-fired power plants}, volume={57-2}, journal={Proceedings of the American Power Conference}, author={Frey, H.Christopher}, year={1995}, pages={1583–1588} }
 @article{frey_rubin_diwekar_1994, title={Modeling uncertainties in advanced technologies: Application to a coal gasification system with hot-gas cleanup}, volume={19}, number={4}, journal={Energy}, author={Frey, H.C. and Rubin, E.S. and Diwekar, U.M.}, year={1994}, pages={449–463} }
 @article{frey_rubin_1992, title={Evaluate uncertainties in advanced process technologies}, volume={88}, number={5}, journal={Chemical Engineering Progress}, author={Frey, H.Christopher and Rubin, Edward S.}, year={1992}, pages={63–70} }
 @article{frey_rubin_1992, title={Evaluation method for advanced acid rain compliance technology}, volume={118}, number={1}, journal={Journal of Energy Engineering}, author={Frey, H.Christopher and Rubin, Edward S.}, year={1992}, pages={38–55} }
 @article{frey_rubin_1992, title={Evaluation of advanced coal gasification combined-cycle systems under uncertainty}, volume={31}, number={5}, journal={Industrial and Engineering Chemistry Research}, author={Frey, Christopher H. and Rubin, Edward S.}, year={1992}, pages={1299–1307} }
 @article{diwekar_frey_rubin_1992, title={Synthesizing optimal flowsheets. Applications to IGCC system environmental control}, volume={31}, number={8}, journal={Industrial and Engineering Chemistry Research}, author={Diwekar, Urmila M. and Frey, Christopher H. and Rubin, Edward S.}, year={1992}, pages={1927–1936} }
 @article{frey_rubin_1991, title={Evaluating advanced technologies for acid rain compliance}, journal={Energy in the 90's}, author={Frey, H.Christopher and Rubin, Edward S.}, year={1991}, pages={172–178} }
 @article{frey_rubin_1991, title={Probabilistic evaluation of advanced SO2/NO(x) control technology}, volume={41}, number={12}, journal={Journal of the Air and Waste Management Association}, author={Frey, H.C. and Rubin, E.S.}, year={1991}, pages={1585–1593} }
 @article{rubin_frey_diwekar_1991, title={Probabilistic modeling of the performance and economics of IGCC systems}, volume={2}, journal={American Society of Mechanical Engineers, Environmental Control Division Publication, EC}, author={Rubin, E.S. and Frey, H.C. and Diwekar, U.M.}, year={1991}, pages={59–66} }