1. F. Sissine, Fuel Cells for Electric Power Production: Future Potential, Federal Role, and Policy Options, in ?FUEL CELLS Trends in Research and Application,? (edited by A. J. Appleby), Hemisphere, New York (1987) pp. 1?18.
2. A. P. Fickett,Sci. Am. 70 (December 1978).
3. L. J. Nuttal and J. F. McElroy,J. Soc. Automotive Engineers (1983) pp. 1?7.
4. R. A. Lemons,J. Power Sources 29 (1990) 252?66.
5. H. G. Wilson, P. B. MacCready and C. R. Kyle,Sci. Am. (March 1989) 90?7.