Groups with a dense system of infinite almost normal subgroups
English version (Springer): Ukrainian Mathematical Journal 43 (1991), no. 7-8, pp 904-908.
Citation Example: Kurdachenko L. A., Kuzennyi N. F., Semko N. N. Groups with a dense system of infinite almost normal subgroups // Ukr. Mat. Zh. - 1991. - 43, № 7-8. - pp. 969–973.
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