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Translated from Matematicheskie Zametki, Vol. 51, No. 5, pp. 51–56, May, 1922.
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Kamornikov, S.F. A problem of Kegel. Math Notes 51, 458–461 (1992). https://doi.org/10.1007/BF01262177
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DOI: https://doi.org/10.1007/BF01262177