1. Ion Propulsion for Space Flight;STUHLINGER,1964
2. Propulsion systems for manned exploration of the solar-system;MOECKEL;Astronautics and Aeronautics,1969
3. MASEK, T. D. and PAWLIK, E. V., Thrust System Technology for Solar Electric Propulsion, AIAA Fourth Propulsion Joint Specialist Conference Paper No. 68–541, Cleveland, Ohio (June 1968)
4. Spacecraft propulsion—now?;BARBER;Astronautics and Aeronautics,1968
5. Primary electric propulsion technology;KERRISK;Astronautics and Aeronautics,1968