1. CLARKE, A.C. “Extra-Terrestrial Relays – Can Rocket Stations Give World-Wide Radio Coverage?,” Wireless World, October 1945, pp. 305–308.
2. HECHLER, M. and VAN DER HA, J.C. “Probability of Collisions in the Geostationary Ring,” Journal of Spacecraft and Rockets, Vol. 18, No. 4, 1981, pp. 361–366.
3. FUSCO, G. and BURATTI, A. “Crowding of the Geostationary Orbit,” Final Report, ESA Contract No. 5705/83/NL/PP (SC), RIPTO, Turin, Italy, October 1984.
4. CHOBOTOV, V.A. “Disposal of Spacecraft at End-of-Life in Geosynchronous Orbit,” in Astrodynamics 1989, AAS Advances in the Astronautical Sciences, Vol. 71, Univelt Inc., San Diego, California, USA, 1990, pp. 377–391.
5. CHOBOTOV, V.A. (editor) Orbital Mechanics, AIAA Education Series, American Institute of Aeronautics and Astronautics, Washington, D.C., USA, 1991, Chapter 13, pp. 335–362.