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Translated from Algebra i Logika, Vol. 21, No. 2, pp. 219–227, March–April, 1982.
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Rybakov, V.V. Bases of quasiidentities of finite modal algebras. Algebra and Logic 21, 149–155 (1982). https://doi.org/10.1007/BF01980756
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DOI: https://doi.org/10.1007/BF01980756