1. Lawden, D.F., Optimal Trajectories for Space Navigation, London: Butterworth, 1963. Translated under the title Optimal'nye traektorii glya kosmicheskoi navigatsii, Moscow: Mir, 1963.
2. Melbourne, W.G. and Sauer, C.G., Optimum Thrust Programs for Power-Limited Propulsion Systems, Acta Astronautica, 1962, vol. 8, no.4, pp. 205–227.
3. Akim, E.L., Stepaniants, V.A., and Tuchin, A.G., Accuracy of Orbit Determination for Low-Thrust Trajectory to The Mars, Advances Astronautical Sci., 1998, AAS 98-387, pp. 1–13.
4. Seywald, H., Trajectory Optimization based on Differential Inclusion, J. Guidance, Control Dynamics, 1994, vol. 17, no.3, pp. 480–487.
5. Ershov, M.G., Beletsky, V.V., and Egorov, V.A., Interplanetary Flight Trajectories with Constant-Power Engines, Kosm. Issl., 1964, vol. 3, no.4, pp. 507–522.