Mathematical Institute, Pedagogical University of Rzeszów, Rejtana 16a, 35-959 Rzeszów, Poland
Bibliografia
[1] J. K. Beem and T. G. Powell, Geodesic completeness and maximality in Lorentzian warped products, Tensor (N.S.) 39 (1982), 31-36.
[2] A. L. Besse, Einstein Manifolds, Springer, 1987.
[3] R. L. Bishop and B. O'Neill, Manifolds of negative curvature, Trans. Amer. Math. Soc. 145 (1969), 1-49.
[4] M. C. Chaki and B. Gupta, On conformally symmetric spaces, Indian J. Math. 5 (1963), 113-122.
[5] R. Deszcz, L. Verstraelen and L. Vrancken, On the symmetry of warped product space-times, Gen. Relativity Gravitation 23 (1991), 671-681.
[6] P. E. Ehrlich, Metric deformations of Ricci and sectional curvature on compact Riemannian manifolds, Ph.D. dissertation, SUNY, Stony Brook, N.Y., 1974.