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2. Argonne National Laboratory. Alternative Fuel Life-Cycle Environmental and Economic Transportation (AFLEET), 2016. See also: https://greet.es.anl.gov/afleet.
3. Burnham, A., Laughlin, M.U.S., DOE Case Study - Compressed Natural Gas Refuse Fleets, 2014. See also: http://www.afdc.energy.gov/uploads/publication/casestudy_cng_refuse_feb2014.pdf.
4. Hybrid hydraulic drive reaps fuel savings;Canter;Tribol. Lubr. Technol.,2008
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