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2. U.S. Energy Information Administration. Fuel Ethanol Overview.http://www.eia.doe.gov/emeu/aer/txt/ptb1003.html(February 16, 2011) .
3. United States Government Printing Office. Energy Independence And Security Act.http://www.gpo.gov/fdsys/pkg/PLAW-110publ140/pdf/PLAW-110publ140.pdf(February 16, 2011) .
4. The impacts of combustion emissions on air quality and climate – From coal to biofuels and beyond