1. HohmannW., Die Erreichbarkeit der Himmelskörper, Oldenbourg, Münich, 1925, pp. 1–88;
2. also The Attainability of Heavenly Bodies, NASA Technical Translation F-44, Nov. 1960, pp. 1–104.
3. A survey of impulsive trajectories.
4. Introduction
5. LawdenD. F., Optimal Trajectories for Space Navigation, Butterworths, London, 1963, pp. 1–123.