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Translated from Algebra i Logika, Vol. 14, No. 1, pp. 28–55, January–February, 1975.
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Maksimova, L.L. Pretabular extensions of LewisS4 . Algebra and Logic 14, 16–33 (1975). https://doi.org/10.1007/BF01668576
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DOI: https://doi.org/10.1007/BF01668576