1. Arthur C. Clarke acknowledged in his book “The Fountains of Paradise”, Ballantine Editions, 1980, p. 303, Information on North-South Oscillation of a Geostationary satellite, provided to him by Walter L. Morgan and Gary Gordon of the COMSAT Laboratories as well as L. Perek, of the UN Outer Space Affairs Division.
2. B.C. Edwards, The Space Elevator NIAC Phase II, Final Report, p. 15.
3. Y. Kozai, A new method to compute lunisolar perturbations in satellite motions, Smithsonian Astrophysical Observatory, SR 349, 1973, pp. 1–27.
4. R. Artuković, The Space Elevator, Physical Principles 〈www.zadar.net/space-elevator/〉.
5. B. Gassend, Linear Dynamics of the Space Elevator in the Absence of Climbers 〈www.isr.us/spaceelevatorconference/2003presentation.html〉.