1. Fundamentals of Astrodynamics;Bate,1971
2. Very low-thrust trajectory optimization using a direct SQP method;Betts;Journal of Computational and Applied Mathematics,2000
3. G.G.J. Bourke, R.D. Sauer, The effect of solar array degradation on electric propulsion spacecraft performance, in: AIAA 9th Electric Propulsion Conference, Bethesda, MD, 1972, paper AIAA 72-444.
4. Advanced ion propulsion systems for affordable deep-space missions;Brophy;Acta Astronautica,2003
5. Electric propulsion for solar system exploration;Brophy;Journal of Propulsion and Power,1998