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