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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 1, pp. 139–148, January–February, 1975.
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Chebotar', A.A. Subgroups of groups with a single relation having normal subgroups satisfying an identity. Sib Math J 16, 112–119 (1975). https://doi.org/10.1007/BF00967468
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DOI: https://doi.org/10.1007/BF00967468