1. Oscillations of the earth;Alterman;Proc. Roy. Soc. London,1959
2. Brouwer, D., , G. M., Clémence, , Methods of Celestial Mechanics, Academic Press, Inc., New York, 1961,
3. Tables of the developments of functions in the theory of elliptic motion;Cayley;Mem. Roy. Astron. Soc.,1861
4. Scientific Papers;Darwin,1908
5. Über Gezeitenreibung beim Zweikörperproblem;Gersternkorn;Z. Astrophys.,1955