1. Global Lorentzian Geometry;Beem,1996
2. Semi-Riemannian Geometry with Applications to Relativity;O’Neill,1983
3. Conformally-flatness and static space–time;Kobayashi,1981
4. Symmetries And Curvature Structure in General Relativity;Hall,2004
5. Introduction to General Relativity;Hughston,1990