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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 13, No. 4, pp. 884–902, July–August, 1972.
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Toponogov, V.A. A characteristic property of a four-dimensional symmetric space of rank I. Sib Math J 13, 616–628 (1972). https://doi.org/10.1007/BF00971054
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DOI: https://doi.org/10.1007/BF00971054