1. N. A. Kilchevskii, Foundations of Tensor Calculus with Applications to Mechanics (Naukova Dumka, Kiev, 1972) [in Russian].
2. L. D. Landau and E.M. Lifshits, Field Theory (Fizmatizd, Moscow, 1988) [in Russian].
3. S. Weinberg, Gravitation and Cosmology (Wiley, New York, 1972; Mir, Moscow, 1975).
4. C. Misner, K. Thorne, and J. Wheeler, Gravitation (W. H. Freeman & Co., San Francisco, 1973; Mir, Moscow, 1977).
5. S. W. Hawking and G. F. R. Ellis, The Large Scale Structure of Space-Time (Cambridge University Press, Cambridge, 1973; Mir, Moscow, 1977).