@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 & Technology}, author={Frey, H. C. and Kuo, P. Y. and Villa, C.}, year={2009}, pages={6875–6881} }
 @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 & Waste Management Association}, author={Frey, H. C. and Kuo, P. Y.}, year={2009}, pages={857–864} }