1. 'Kerrisk, D. J., and Kaufman, H. R. "Electric Propulsion Systems for Primary Spacrcraft Propulsion, 'I AIAA Papcr 67-424, AIAA Third Propulsion .Toint Specialists Conference, Washington, D.C., July 1967. 4Stcarns. J. W., and Kerrisk, n. J. "Solar-I'owered Elcctric Propulsion Engineering and Applications, 'I AIAA Papcr No. 66-576. AIAA Second Propulsion Joint Specialists Conference, Colorado Springs, Colo., Junc 1966.
2. 5'iSolarPowered Elcctric Propulsion Spacecraft Study, " Final Report No. SSD-50094-R (preoarcd for JPI. undcr JPL. Contract 9511441. De=. 1965, Hughes Aircraft Company, CuiLrr City, Calif.
3. 3"1975 Jupitcr Flyby Mission Using a Solar Elec- 'Kaufman, H. R. "An Ion Rocket with an tric Propulsion Spacecraft,I' Report No. ASD760-18, Mar. 1968, Jet Propulsion I,ahorator)i, TN D-585, Jan. 1961, National Aeronautics and l'asadana, Calif. Spacc Administration, Washington, D. C