1. C.W. Misner, K. S. Thorne, and J. A. Wheeler, Gravitation (Freeman, San Francisco, 1973).
2. T. Regge, Cronache dell’Universo (Boringhieri, Torino, 1981).
3. A. Cherepaschuk, in: Astronomiya: Vek XXI ed. by V. Surdin (Fryazino, 2007).
4. A. A. Logunov, M. A. Mestverishvili, and V. V. Kiselev, Phys. Part. Nucl. 37, 317 (2006).
5. L. D. Landau and E. M. Lifshitz, The Classical Theory of Fields (Butterworth-Heinemann, 1980).