1. R. J. Rosa,Advanced Propulsion Systems, Proceedings of a Symposium held in Los Angeles, California, December 11–13, 1957, edited by M. Alperin, and G. P. Sutton (Pergamon Press, New York, 1959), p. 175.
2. R. J. Rosa and A. R. Kantrowitz, Proceedings of the Seminar on Advanced Energy Sources and Conversion Techniques, Pasadena, California, November 3–7, 1958; also,Direct Conversion of Heat to Electricity, edited by J. Kaye, and J. A. Welsh, (John Wiley & Sons, Inc., New York, 1960), Chap. 12.
3. S. Way, Westinghouse Scientific Paper 6-40509-2-P1, February, 1960.