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 @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 & Waste Management Association}, author={Frey, H. C. and Kim, K. and Pang, S. H. and Rasdorf, W. J. and Lewis, P.}, year={2008}, pages={1274–1287} }