1. R.W. Bussard Nuclear fission rockets: Problems, progress, and promise, paper presented at the Seminar on Astronautical Propulsion, Milano-Varenna, Italy, September, 1960, to be published by Pergamon, London
2. Chapter 2;Bussard,1958
3. Nuclear rocket propulsion possibilities, Chapter 17;Bussard,1959
4. Nuclear propulsion, Section IV.E.l;Orndoff,1961
5. Range and accuracy of long-range ballistic missiles;Henry;J. Brit. Inter-planet. Soc.,1959