1. US Energy Information Administration, Petroleum and Other Liquids, http://www.eia.gov/petroleum/data.cfm#prices [accessed 05.02.12].
2. Ideal and effective efficiencies of cell reactions and comparison to Carnot cycles;Vielstich,2003
3. Satyapal S. Hydrogen and fuel cell activities. 5th International conference on polymer batteries & fuel cells, Argonne, Illinois: US Department of Energy: Energy Efficiency & Renewable Energy; 2011.
4. Well-to-wheels greenhouse gas emissions and petroleum use for mid-size light-duty vehicles;Nguyen,2010
5. Introduction to fuel-cell types;Hamnett,2003