1. 14, Orbiters," Paper 72-464, April 1972, AIAA.
2. Irace, W.R. and Atkins, K.L. "Understandina the Solar Electric Multimission-Concept," Paper 72-469, April 1.972, A I M .
3. Gould. L.M. "SEP fliah-Power Communication Satellite, Pap& 72-467, April 1972, AIAA.