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Additional information
Translated from Algebra i Logika, Vol. 16, No. 4, pp. 457–471, July–August, 1977.
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Roman'kov, V.A. Unsolvability of the endomorphic reducibility problem in free nilpotent groups and in free rings. Algebra and Logic 16, 310–320 (1977). https://doi.org/10.1007/BF01669283
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DOI: https://doi.org/10.1007/BF01669283