1. Optimal Trajectories for Space Navigation;Lawden,1963
2. Optimal Space Trajectories;Marec,1979
3. On an analytical solution of the optimum trajectory problem in a gravitation field;Azizov;Celestial Mechanics,1986
4. Investigation of optimal trajectories in a central Newtonian field;Azimov,1991
5. An Introduction to the Mathematics and Methods of Astrodynamics;Battin,1987