1. Climate change 2007: mitigation of climate change: contribution of working group III to the fourth assessment report;IPCC,2007
2. IEA, energy balances of OECD countries (2006 edition) and energy balances of Non-OECD countries (2006 edition). See http://earthtrends.wri.org/text/energy-resources/variable-668.html.
3. Trends in transportation sector technology energy use and greenhouse gas emissions;Ortmeyer;Proc IEEE,2001
4. Review of small stationary reformers for hydrogen production;Ogden;Rep Int Energy Agency,2001
5. On-site hydrogen generators from hydrocarbons. See http://www.ika.rwth-aachen.de/r2h/index.php?title=Onsite_Hydrogen_Generators_from_Hydrocarbons&oldid=4952, www.hygear.nl, www.precision-combustion.com, www.delphi.com, www.ise.fraunhofer.de, innovatek.com, www.ztekcorporation.com.