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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 383–387, May–June, 1977.
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Zelinskii, Y.B. An extension theorem and domain preservation criteria for multivalued maps. Ukr Math J 29, 291–294 (1977). https://doi.org/10.1007/BF01104478
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DOI: https://doi.org/10.1007/BF01104478