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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 15, No. 5, pp. 963–971, September–October, 1974.
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Avkhadiev, F.G. Sufficient conditions for one-sheetedness in nonconvex domains. Sib Math J 15, 679–685 (1974). https://doi.org/10.1007/BF00966428
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DOI: https://doi.org/10.1007/BF00966428