References
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- F. Dobarro and E. L. Dozo, Scalar curvature and warped products of Riemanman manifolds, Trans. Amer. Math. Soc. 303 (1987), 161-168. https://doi.org/10.1090/S0002-9947-1987-0896013-4
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- B. O'Neill, Semi-Riemannian Geometry Academic, New York, 1983.