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Supported in part by the National Science Foundation under grant number DMS-8601342.
Supported in part by the Danish Natural Science Research Council.
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Beem, J.K., Ehrlich, P.E. & Markvorsen, S. Timelike isometries and killing fields. Geom Dedicata 26, 247–258 (1988). https://doi.org/10.1007/BF00183017
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DOI: https://doi.org/10.1007/BF00183017