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References
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This article is the text of a talk given at the Symposium on Differential Geometry in Debrecen, Hungary, on August 28–September 3, 1975.
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Jakubowicz, A. On certain classification of the Riemann spaces and 4-dimensional Einstein space-times. Period Math Hung 9, 49–53 (1978). https://doi.org/10.1007/BF02018920
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DOI: https://doi.org/10.1007/BF02018920