1. Hatsopoulos, G. W., and E. P. Gyftopoulos. Thermionic Energy Conversion, The MIT Press, Cambridge, Massachusetts (1973).
2. Miskolczy, G. and F. N. Huffman. 1980 IEEE Conference on Plasma Science, May 19–21, 1980, Madison, Wisconsin.
3. Fitzpatrick, G. (). and E. J. Britt. 1980 IEEE Conference on Plasma Science, May 19–21, Madison, Wisconsin.
4. Chiu, H. S., D. T. Shaw. C. N. Manikopoulos and C. H. Lee. Twelfth Intersociety Energy Conversion Engineering Conference, September 1–5, Washington, D.C.
5. Thomassen, K. I. J. Appl. Phys. 34, No. 6 1622 (1963).