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Translated from Algebra i Logika, Vol. 17, No. 4, pp. 468–477, July–August, 1978.
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Smirnov, D.M. Correspondence between regular varieties of unary algebras and semigroups. Algebra and Logic 17, 310–315 (1978). https://doi.org/10.1007/BF01674782
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DOI: https://doi.org/10.1007/BF01674782