1. 1National Research Council, Thermionics Quo Vadis? An Assessment of the DTRA's Advanced Thermionics Research and Development Program, (2001), 84p.
2. 2National Research Council, Laying the Foundation for Space Solar Power: An Assessment of NASA's Space Solar Power Investment Strategy, (2001), 94p.
3. 4D. Hoffman, "A Parametric Assessment of the Mission Applicability of Thin-Film Solar Arrays", NASA/TM-2002-211720.
4. Dye-sensitized solar cells