1. G. H. Darwin, The Tides and Kindred Phenomena in the Solar System (CreateSpace Independent Publishing Platform, 2013; Nauka, Moscow, 1965).
2. G. J. F. MacDonald, Rev. Geophys. 2, 467 (1964).
3. P. Goldreich, Rev. Geophys. 4, 411 (1966).
4. V. V. Beletskii, Preprint Inst. Prikl. Matem. ANSSSR No. 43 (IPM AN SSSR, Moscow, 1978).
5. D. J. Webb, Geophys. J. R. Astron. Soc. 70, 261 (1982).