Groups with invariant infinite non-Abelian subgroups
English version (Springer): Ukrainian Mathematical Journal 40 (1988), no. 3, pp 267-273.
Citation Example: Kuzennyi N. F., Levishchenko S. S., Semko N. N. Groups with invariant infinite non-Abelian subgroups // Ukr. Mat. Zh. - 1988. - 40, № 3. - pp. 314-321.
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