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Translated from Algebra i Logika, Vol. 31, No. 2, pp. 145–166, March–April, 1992.
Translated by the author
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Maksimova, L.L. Modal logics and varieties of modal algebras: The beth properties, interpolation, and amalgamation. Algebr Logic 31, 90–105 (1992). https://doi.org/10.1007/BF02259848
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DOI: https://doi.org/10.1007/BF02259848