1. “National Hydrogen Energy Roadmap”, United States Department of Energy, results from the National Hydrogen Energy Roadmap Workshop, Washington DC, April 2-3, 2002. http://www.eere.energy.gov/hydrogenandfuelcells/pdfs/national_h2_roadmap.pdf;
2. “Hydrogen Posture Plan”, United States Department of Energy, February 2004. http://www.eere.energy.gov/hydrogenandfuelcells/pdfs/hydrogen_posture_plan.pdf.
3. “The Hydrogen Initiative”, American Physical Society Panel on Public Affairs, March 2004;
4. Hydrogen lifts off — with a heavy load
5. Not So Simple