1. D. M. Cooper, R. L. Jaffe and J. O. Arnold, J. Spacecraft and Rockets 22, 60 (1985).
2. AIAA Paper 87-2074, AIAA/SAE/ASME/ASEE;GY Anderson,1987
3. “Pioneering the Space Frontier”, Report of the National Commission on Space, (Bantam Books, New York, 1986).
4. B. C. Garrett and D. G. Truhlar, J. Phys. Chem. 83, 2921 (1979).
5. See, for example, C. W. Bauschlicher, S. R. Langhoff and P. R. Taylor, paper presented at this workshop.