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Novosibirsk. Translated fromSibirskiî Matematicheskiî zhurnal, Vol. 33, No. 6, pp. 118–130, November–December, 1992.
Translated by the author
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Maksimova, L.L. An analog of Beth's theorem in normal extensions of the modal logic K4. Sib Math J 33, 1052–1065 (1992). https://doi.org/10.1007/BF00971028
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DOI: https://doi.org/10.1007/BF00971028