1. Shirokov, M. F. and Fisher, I. Z. (1962).Astron. Zh. 39, 899 (in Russian).
2. Ellis, G. F. R. (1984). InGeneral Relativity and Gravitation, Bertotti, B., de Felici F., and Pascolini, A., eds. (Reidel, Dordrecht).
3. Zalaletdinov, R. M. (1992).Gen. Rel. Grav. 24, 1015.
4. Zalaletdinov, R. M. (1992). ?Macroscopic gravity: A new setting of the problem?. Preprint, Institute of Nuclear Physics, Uzbek Academy of Sciences, November 1992 (Tashkent), 1.
5. Zalaletdinov, R. M. (1992). InProc. 5th Regional Conj. on Mathematical Physics (Edirne, Turkey, 15?22 Dec. 1991), M. Koca, ed. (World Scientific, Singapore), to appear.