@article{AL_1978_17_2_a7,
     author = {V. V. Rybakov},
     title = {A decidable noncompact extension of the logic ${\rm S}4$},
     journal = {Algebra i logika},
     pages = {210--219},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1978_17_2_a7/}
}