1. Melbourne, W. G. "Interplanetary Trajectories and Payload Capabilities of Advanced Propulsion Vehicles," Tech. Rep. no. 32-68, Jet Propulsion Laboratory, Pasadena, Calif., 1961.
2. Melbourne, W. G. and Sauer, C. G., Jr. "Optimum Thrust Programs for Power-Limited Propulsion Systems," Tech. Rep. no. 82-118, Jet Propulsion Laboratory, Pasadena, Calif., 1961.