Minimum Propellant Solution to an Orbit-to-Orbit Transfer Using a Low Thrust Propulsion System
An Introduction to the Problem of Low Thrust Orbital Transfer
Study of Low-Acceleration Space Transportation Systems Summary Report, Jul. 1964 - Jun. 1965
Low Energy Stage Study. Volume 2: Requirements and Candidate Propulsion Modes
Guidance, Navigation, and Control Study for a Solar Electric Propulsion Spacecraft
Low Energy Stage Study. Volume 1: Executive Summary