1. Ivanov, Yu.N. and Shalaev, Yu.V., Steepest descent method as applied to the calculation of interorbital trajectories with limited power engines, Kosm. Issled., 1964, vol. 2, no. 3.
2. Edelbaum, T.N., Optimum power-limited orbit transfer in strong gravity fields, AIAA J., 1965, vol. 3, no. 5, pp. 921–925.
3. Grodzovskii, G.L., Ivanov, Yu.N., and Tokarev, V.V., Mekhanika kosmicheskogo poleta. Problemy optimizatsii (Space Flight Mechanics. Optimization Problems), Moscow: Nauka, 1975.
4. Eneev, T.M., Egorov, V.A., Efimov, G.B., et al., Some methodical problems of low thrust trajectory optimization, Preprint of Keldysh Inst. of Applied Mathematics, Russ. Acad. Sci., Moscow, 1996, no. 110, p. 124.
5. Kechichian, J.A., Optimal low-earth-orbit-geostationary-earth-orbit intermediate acceleration orbit transfer, J. Guid., Control, Dyn., 1997, vol. 20, no. 4, pp. 803–811.