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Translated from Algebrai Logika, Vol. 19, No. 2, pp. 173–193, March–April, 1980.
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Kartashov, V.K. Quasivarieties of unary algebras with a finite number of cycles. Algebra and Logic 19, 106–120 (1980). https://doi.org/10.1007/BF01669836
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DOI: https://doi.org/10.1007/BF01669836