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On certain classification of the Riemann spaces and 4-dimensional Einstein space-times |
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| Authors: | A. Jakubowicz |
| Affiliation: | (1) Skr. Poczt. Nr 566, PL-70-952 Szczecin 2, Poland |
| Abstract: | |
| Keywords: | Primary 53C20 53C25 Secondary 53B20 |
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