1. Baierlein, R. (1976).Gen. Rel. Grav.,7, 583.
2. Braginsky, V. B., and Mensky, M. B. (1975).Pis'ma Zh. Eksp. Teor. Fiz.,13, 585; (1972).Gen. Rel. Grav.,3, 401.
3. Misner, C., Thorne, K., and Wheeler, J. (1973).Gravitation (Freeman, San Francisco).
4. IAU Symposium;V. B. Braginsky,1974
5. Braginsky, V. B., Grishchuk, L. P., Doroshkevich, A. G., Zeldovich, Ya. B., Novikov, I. D., and Sazhin, M. V. (1973).Zh. Eksp. Teor. Fiz.,65, 1729 [(1974).Sov. Phys. JETP,38, 865].