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2016 journal article
Comparison of vehicle-specific fuel use and emissions models based on externally and internally observable activity data
Transportation Research Record, (2570), 30–38.
By: J. Hu, H. Frey & S. Washburn
Effect of biodiesel fuels on real-world emissions of passenger locomotives
Environmental Science & Technology, 50(21), 12030–12039.
By: B. Graver, H. Frey & J. Hu
2014 journal article
Method for modeling driving cycles, fuel use, and emissions for over snow vehicles
Environmental Science & Technology, 48(14), 8258–8265.
By: J. Hu, H. Frey, G. Sandhu, B. Graver, G. Bishop, B. Schuchmann, J. Ray