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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 1, pp. 124–131, January–February, 1975.
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Toponogov, V.A. Riemannian spaces of diameter π. Sib Math J 16, 99–105 (1975). https://doi.org/10.1007/BF00967466
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DOI: https://doi.org/10.1007/BF00967466