1. Ministério de Minas e Energia (2007) Balanço Energético Nacional/BEN 2006. In www.mme.gov.br (accessed on February 7, 2007).
2. Performance evaluation of hybrid-drive buses and potential fuel savings in Brazilian urban transit;D’Agosto;Transportation,2004
3. International Energy Agency (1999) Automotive Fuels for the Future. The Search for Alternative. Office of Energy Efficiency Technology and R&D, Paris.
4. Life cycle assessment of gasoline and diesel;Furuholt;Resources Conservation and Recycling,1995
5. Fuel-cycle fossil energy use and greenhouse gas emissions of fuel ethanol produced from U.S. midwest corn;Wang,1997