1. Stephenson, F. R. and Morrison, L. V.: 1984, ?Long-Term Changes in the Rotation of the Earth: 700 B.C. to A. D. 1980?,Phil. Trans. Roy. Soc. Lond. A313, 47?70.
2. Seidelmann, P. K., Santoro, E. J. and Pulkkinen, K. F.: 1985, ?Systematic Differences between Planetary Observations and Ephemerides?, in V. Szebehely and B. Balazs (eds.),Dynamical Astronomy, University of Texas Press, Austin, Texas, p. 55.
3. Stumpff, P. and Lieske, J. H.: 1984, ?The Motion of the Earth-Moon System in Modern Tabular Ephemerides: II. Inertial Motion, Mean Longitude of the Sun, and General Precession in Longitude?,Astron. Astrophys. 130, p. 219.
4. Szebehely, V. G.: 1978, ?Stability of Artificial and Natural Satellites?,Celest. Mech. 18, 383?389.