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Translated from Algebra i Logika, Vol. 15, No. 1, pp. 39–52, January–February, 1976.
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Budkin, A.I. Quasi-identities in a free group. Algebra and Logic 15, 25–33 (1976). https://doi.org/10.1007/BF01875929
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DOI: https://doi.org/10.1007/BF01875929