A class of groups with invariant subgroups of infinite index
English version (Springer): Ukrainian Mathematical Journal 40 (1988), no. 4, pp 377-381.
Citation Example: Kraichuk A. V. A class of groups with invariant subgroups of infinite index // Ukr. Mat. Zh. - 1988. - 40, № 4. - pp. 440-445.
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