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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No.1, pp. 132–142, January–February, 1986.
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Nikolaev, I.G., Shefel', S.Z. Differential properties of mappings, conformal at a point. Sib Math J 27, 106–114 (1986). https://doi.org/10.1007/BF00969348
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DOI: https://doi.org/10.1007/BF00969348