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@article{AL_1988_27_6_a3, author = {M. Zakharyaschev}, title = {Syntax and semantics of modal logics that contain ${\rm S}4$}, journal = {Algebra i logika}, pages = {659--689}, publisher = {mathdoc}, volume = {27}, number = {6}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1988_27_6_a3/} }
M. Zakharyaschev. Syntax and semantics of modal logics that contain ${\rm S}4$. Algebra i logika, Tome 27 (1988) no. 6, pp. 659-689. http://geodesic.mathdoc.fr/item/AL_1988_27_6_a3/