1. The Mars Project;Von Braun,1953
2. Electrical propulsion system for space ships with nuclear power source;Stuhlinger;Journal of the Astronautical Sciences, Part I,1955
3. Electrical propulsion system for space ships with nuclear power source;Stuhlinger;Journal of the Astronautical Sciences, Part II,1956
4. Electrical propulsion system for space ships with nuclear power source;Stuhlinger;Journal of the Astronautical Sciences, Part III,1956
5. K.A. Ehricke, C.M. Whitlock, R.L. Chapman, C.H. Purdy, Calculations on a manned nuclear propelled space vehicle, ARS Report 532-57, 1957.