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Translated from Matematicheskie Zametki, Vol. 38, No. 4, pp. 494–502, October, 1985.
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Kashintsev, E.V. Analogs of Magnus' theorem for groups with small contraction, and the fact that they cannot be strengthened. Mathematical Notes of the Academy of Sciences of the USSR 38, 779–783 (1985). https://doi.org/10.1007/BF01158401
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DOI: https://doi.org/10.1007/BF01158401