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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 6, pp. 803–807, November–December, 1988.
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Piskunov, A.G. Cardinality of open σ-Compact sets in the space of noncompact subgroups of a topological group. Ukr Math J 40, 679–683 (1988). https://doi.org/10.1007/BF01057194
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DOI: https://doi.org/10.1007/BF01057194