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Translated from Algebra i Logika, Vol. 16, No. 4, pp. 472–490, July–August, 1977.
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Rybakov, V.V. Noncompact extensions of the logicS4 . Algebra and Logic 16, 321–334 (1977). https://doi.org/10.1007/BF01669284
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DOI: https://doi.org/10.1007/BF01669284