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Translated from Matematicheskie Zametki, Vol. 39, No. 6, pp. 859–868, June, 1986.
The author is grateful to A. V. Arkhangel'skii for setting the problems and for discussing the results obtained in this article, and also O. V. Sipacheva for her useful discussions.
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Shakhmatov, D.B. Precalibers of σ-compact topological groups. Mathematical Notes of the Academy of Sciences of the USSR 39, 465–470 (1986). https://doi.org/10.1007/BF01157033
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DOI: https://doi.org/10.1007/BF01157033