1. Kechichian, J.A.: The optimization of continuous constant acceleration transfer trajectories in the presence of the J 2 perturbation. Astrodynamics 1999, 1627–1648 (2000)
2. Goodson, T.D.: Fuel-optimal Control and Guidance for Low-and Medium-Thrust Orbit Transfer. Georgia Institute of Technology, Atlanta (1995)
3. Chien-Hsiung, C., Speyer, J.L.: Periodic optimal hypersonic scramjet cruise. Optim. Control Appl. Methods 8(3), 1403–1408 (1985)
4. C-Hgoodson, C., Troy, D., Ledsinger, L., Hanson, J.: The second variation and neighboring optimal feedback guidance for multiple burn orbit transfers. In: Guidance, Navigation, and Control Conference (1995)
5. Betts, J.T., Erb, S.O.: Optimal low thrust trajectories to the moon. SIAM J. Appl. Dyn. Syst. 2(2), 144–170 (2003)