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- [6] THE KEPLERIAN METRIC OF SPACE-TIME ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1987, 67 (05): : T426 - T427
- [9] CLASSIFICATION OF SPACE-TIME CURVATURE TENSOR .4. GENERAL THEORY OF METRIC CLASSIFICATION JOURNAL OF MATHEMATICS AND MECHANICS, 1967, 16 (12): : 1291 - &