1. Presented as Preprint 63051-63 at the AIAA Electric Propulsion Conference, Colorado Springs, Colo , March11-13, 1963; revision received January 17,1964 This work was supported in part by National Science Foundation Grant NSFG19776 and in part by U S Air Force Grant AF-AFOSRG107-163
2. September 1956;Langmuir D B
3. Shelton, H , "Commentaries on the optimization of constant thrust electrical propulsion systems," Ramo Wooldridge Res Lab Rept ERL-LM-101 (1956)