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Donetsk. Translated fromSibirskiį Matematicheskiį Zhurnal, Vol. 39, No. 2, pp. 405–408, March–April, 1998.
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Potëmkin, V.L., Ryazanov, V.I. On mappings with constraints on the measure of dilatation. Sib Math J 39, 354–357 (1998). https://doi.org/10.1007/BF02677519
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DOI: https://doi.org/10.1007/BF02677519