1. Lense, J., Thirring, H.: Phys. Z. 19, 156 (1918)
2. Everitt, C.W.F.: In: Bertotti, B. (ed.) Experimental Gravitation, pp. 331–360. Academic Press, New York (1974)
3. Ciufolini, I., Pavlis, E.C.: Nature 431, 958–960 (2004)
4. Iorio, L.: J. Geodesy 80, 128–136 (2006)
5. Braginsky, V.B., Polnarev, A.G.: Pis’ma Zh. Eksp. Teor. Fiz. 31, 444 [JETP Lett. 31, 415 (1980)] (1980)