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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 387–389, May–June, 1977.
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Kleiner, I.Z. Closure and boundary operators in topological spaces. Ukr Math J 29, 295–296 (1977). https://doi.org/10.1007/BF01104479
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DOI: https://doi.org/10.1007/BF01104479