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Additional information
Podolsk (Moscow Region). Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No. 4, pp. 67–83, July–August, 1986.
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Kolmakov, Y.A. A theorem on freness for groups with one defining relation in the variety of polynilpotent groups. Sib Math J 27, 523–537 (1986). https://doi.org/10.1007/BF00969165
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DOI: https://doi.org/10.1007/BF00969165