1. Global warming: the complete briefing;Houghton,2004
2. Hydrogen-fueled internal combustion engines;Verhelst;Prog Energy Combust Sci,2009
3. On the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC. Directive 2009/28/EC of the European Parliament and of the Council; 23rd April 2009.
4. Energy Independence and Security Act of 2007. Public Law 110-140. In: 110th Congress, DOCID: f:publ140.110; 2007.
5. “E85: An alternative fuel,” Alternative Fuels and Advanced Vehicles Data Center, US Department of Energy. 23/02/2012.