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80. P. Petersen, Riemannian Geometry, Springer-Verlag, New York, 1998.

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83. R. K. Sachs and H. Wu, Generol Relativity for Mathematicians, GTM Series, Volume 48,

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87.

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91. B. Wegner, Comments on "A Remark on totally Vicious Space-Time", J. of Geometry 36

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92. P. M. Williams, Completeness and its stability on manifolds with connection, Ph.D. Thesis,

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94. S. T. Yau, Problem Section, in Ann. of Math. Studies (S. T. Yau, ed.), vol. 102, Princeton

University Press, Princeton, New Jersey, 1982, pp. 669-706.

DEPARTMENT OF MATHEMATICS, UNIVERSITY OF FLORIDA, GAINESVILLE, FLORIDA

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