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@article{MT_1989_12_a6, author = {V. V. Rybakov}, title = {Admissibility of rules of inference in the modal system $G$}, journal = {Matemati\v{c}eskie trudy}, pages = {120--138}, publisher = {mathdoc}, volume = {12}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MT_1989_12_a6/} }
V. V. Rybakov. Admissibility of rules of inference in the modal system $G$. Matematičeskie trudy, Tome 12 (1989), pp. 120-138. http://geodesic.mathdoc.fr/item/MT_1989_12_a6/