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MR933841
(89e:53095)
53C50
(53C22)
Beem, J. K.; Ehrlich, P. E.; Markvorsen, S. Timelike isometries of space-times with nonnegative sectional curvature. Topics in differential geometry, Vol. I, II (Debrecen, 1984), 153--165, Colloq. Math. Soc. János Bolyai, 46, North-Holland, Amsterdam, 1988. |
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