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Translated from Matematicheskie Zametki, Vol. 27, No. 1, pp. 7–20, January, 1980.
The author thanks D. M. Smirnov and V. A. Gorbunov for useful discussions. The author also thanks L. A. Skornyakov for constant encouragement and assistance.
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Kartashov, V.K. Quasivarieties of unars. Mathematical Notes of the Academy of Sciences of the USSR 27, 5–12 (1980). https://doi.org/10.1007/BF01149807
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DOI: https://doi.org/10.1007/BF01149807