1. Klemperer, W. B., ARS J. 30 (1960), 123.
2. Beletskiy, V. V., in M. Roy (ed.), Dynamics of Satellites, Academic Press, New York, 1963, p. 219.
3. Zlatousov, V. A., Okhotsimsky, D. E., Sarghev, V. A., and Torsheveskey, A. P., in H. Görtier (ed.), Proceedings of XI International Congress of Applied Mechanics, Springer-Verlag, Berlin, 1964, p. 436.
4. Brereton, R. C. and Modi, V. J., in M. Lunc (ed.), Proceedings of the XVII International Astronautical Federation Congress, Gordon and Breach Science Publishers, Inc., New York, 1967, p. 179.
5. Kane, T. R., AIAA J. 3 (1966), 726.