Egorov, Vsevolod Alexandrovich (1957) "Specific problems of a flight to the Moon", Physics - Uspekhi, Vol. 63, No. 1a, pages 73–117.
Egorov’s work is mentioned in: Boris V. Rauschenbakh, Michael Yu. Ovchinnikov, and Susan M. P. McKenna-Lawlor, Essential Spaceflight Dynamics and Magnetospherics (Dordrecht, Netherlands: Kluwer Academic Publishers, 2002), pages 146–147. (The latter reference is available on-line at: Google Books.)
