Egorov, Vsevolod Alexandrovich (1957) "Specific problems of a flight to the Moon", Physics – Uspekhi, Vol. 63, No. 1a, pp. 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), pp. 146–147. (The latter reference is available on-line at Google Books.)
doi.org
Shevchenko (2016). The First Maps, Atlas and Globus of the Farside. In: Lunar and Planetary Cartography in Russia. Astrophysics and Space Science Library. doi:10.1007/978-3-319-21039-1_1.