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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 24, No. 6, pp. 800–806, November–December, 1972.
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Khamishon, A.Z. Semigroups of multivalued transformations that define topological spaces. Ukr Math J 24, 641–646 (1972). https://doi.org/10.1007/BF01085414
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DOI: https://doi.org/10.1007/BF01085414