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Translated from Matematicheskii Zametki, Vol. 51, No. 2, pp. 72–76, February, 1992.
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Nikolaevskii, Y.A. Extrinsic spheres in a symmetric space. Math Notes 51, 155–158 (1992). https://doi.org/10.1007/BF02102122
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DOI: https://doi.org/10.1007/BF02102122