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Hawking, S. W., Ellis, G. F. R.,The large-scale structure of space-time, Cambridge-London-New York-Melbourne, Cambridge University Press, 1973.
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Work partially supported by NSF grant MCS7901310 at Brown University.
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Dajczer, M., Nomizu, K. On the boundedness of Ricci curvature of an indefinite metric. Bol. Soc. Bras. Mat 11, 25–30 (1980). https://doi.org/10.1007/BF02584877
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DOI: https://doi.org/10.1007/BF02584877