[1] US DOE, Off Energy Efficiency & Renewable Energy, Fuel Cell Technol Off, 1000 Independence Ave SW, Washington, DC 20585 USA
[2] Cadmus Grp Inc, 7700 Old Georgetown Rd,Suite 800, Bethesda, MD 20814 USA
[3] Energy & Environm Econ Inc, 101 Montgomery St,Suite 1600, San Francisco, CA 94104 USA