1. Adamson, K. -A. (2009). Small stationary survey. Fuel Cell Today.
2. Brown, L. R. (2010). Rising temperatures raise food prices – Heat, drought and a failed harvest in Russia. Plan B Updates. Washington, DC: Earth Policy Institute.
3. Callaghan, L., et al. (2010). 2010 transport fuel cell analysis. Fuel Cell Today.
4. DEFRA (Department for Environment, Food and Rural Affairs). (2007). UK biomass strategy. Defra.
www.defra.gov.uk
5. DOE (US Department of Energy). (2004a). Report for the Congress. A hydrogen economy and fuel cells: An overview. Washington, DC: DoE.