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Translated from Algebra i Logika, Vol. 28, No. 5, pp. 493–512, September–October, 1989.
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Bestsennyi, I.P. Quasiidentities of finite unary algebras. Algebra and Logic 28, 327–340 (1989). https://doi.org/10.1007/BF01979193
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DOI: https://doi.org/10.1007/BF01979193