1. Heidmann, J. Saha crater: a candidate for a SETI lunar base, Academy Transactions Note. Acta Astronautica, 1994, 32, 471–472.
2. Heidmann, J. Sharing the Moon by thirds: an extended Saha crater proposal. Advances in Space Research, 2000, 26, 371–375.
3. Dunham, D. W. Utilization of libration-point orbits. In Problems of Astronautics and Celestial Mechanics. (Proceedings of an International Symposium held at Politecnico di Torino, 10–12 June 1987 in honor of the late Professor Giuseppe Colombo. Published as Supplement to vol. 122 of the “Atti dell'Accademia delle Scienze di Torino” by the Academy of Sciences of Turin, 1990, pp. 239–274.)
4. Lagrange, J. L. In Oeuvres, ed. M. A. J. Serret. Gauthier-Villars, Paris, vol. 6, 1873. (Lagrange's main article on the three-body problem was dated 1772, but was not originally published until 1777 by Panekoucke, Paris; see p. 304 of Ref. [3].)
5. Szebehely, V. Theory of Orbits — The Restricted Problem of Three Bodies. Academic Press, New York and London, 1967.