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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 32, No. 3, pp. 355–360, May–June, 1980.
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Protasov, I.V. Topological properties of the lattice of subgroups. Ukr Math J 32, 236–240 (1980). https://doi.org/10.1007/BF01089759
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DOI: https://doi.org/10.1007/BF01089759