1. Feissel M. and Gambis D. (1993) Adv. in Space Research, Pergamon Press, 13, no 11, pp. 143–144
2. Moritz G. and Muller A. (1987) Earth rotation: theory and observation. Ungar Publ. Co, New York.
3. Carter W.E. and Robertson D.S. (1993) Adv. in Space Research Pergamon Press. 13, no 11, pp. 197–198
4. Blinov N.S., Zharov V.E. and Sazhin M.V. (1989) Proc. Intern. Symp. “Geodesy and Physics of the Earth”, Potsdam, 102, part 1, pp. 59–60
5. Bichkov S.I. et. al. (1975) Laser Gyroscope. Moscow (in Russian)