1. The impact of oil prices on income and energy
2. FUEL CHOICE FOR MULTI-FUEL VEHICLES
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4. T. Riis , E. F.Hagen, G.Sandrock, P. J. S.Vie and O.Ulleberg, Hydrogen Production and Storage, International Energy Agency, Paris, 2006, http://www.iea.org/Textbase/publications/free_new_Desc.asp?PUBS_ID=1591
5. Hydrogen-storage materials for mobile applications