1. 1) Neufeld, M. J.: Von Braun and the Lunar-orbit Rendezvous Decision: Finding a Way to Go to the Moon, Acta Astronautica, 63 (2008), pp. 540-550.
2. 2) Meditch, J. S.: On the Problem of Optimal Thrust Programming for a Lunar Soft Landing, IEEE Trans. Autom. Control, 9 (1964), pp. 477-484.
3. 3) Ulybyshev, Y.: Spacecraft Trajectory Optimization Based on Discrete Sets of Pseudo Impulses, J. Guid. Control Dynam., 32 (2009), pp. 1209-1217.
4. 4) Cho, D. H., Jeong, B. Y., Lee, D. H. and Bang H. C.: Optimal Perilune Altitude of Lunar Landing Trajectory, Int. J. Aeronaut. Space Sci., 10 (2009), pp. 67-74.
5. 5) Huang, W. D., Wang, W. and Xi, X. N.: Overall Mission Trajectory Optimization for Manned Lunar Landing Mission Using a Hybrid Algorithm, the 2nd Information Engineering and Computer Science (ICIECS), Wuhan, China, 2010, pp. 1-6.