1. Gain Indexing Schemes for Low-Thrust Perturbation Guidance;Bauer;Journal of Guidance,1983
2. Optimum Guidance for a Low Thrust Interplanetary Vehicle;Breakwell;AIAA Journal,1966
3. Applied Optimal Control;Bryson,1975
4. Halo-Orbit and Lunar-Swingby Missions of the 1990s;Farquhar;Acta Astronautica,1991
5. Trajectory Design for Solar Sailing from Low-Earth Orbit to the Moon;Fekete;Advances in the Astronautical Sciences,1992