@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/}
}