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@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/} }
V. V. Rybakov. A decidable noncompact extension of the logic ${\rm S}4$. Algebra i logika, Tome 17 (1978) no. 2, pp. 210-219. http://geodesic.mathdoc.fr/item/AL_1978_17_2_a7/