1. Beletskii, V. V.: 1971, ?On Cassini's Laws?. Preprint No. 79, Institute of Applied Mathematics, Academy of Sciences, U.S.S.R.
2. Tisserand, F.: 1891,Traité de mécanique céleste, Tome II, Paris.
3. G. N. Duboshin (ed.) 1967,Guiding Instructions on Celestial Mechanics and Astronomy, Nauka, Moscow.
4. Lagrange, J. L.: 1870,Oeuvres, Tome V, Gauthier-Villars, Paris.
5. Laplace, P. S.: 1793,Mécanique céleste, Paris.