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@article{DAN_1985_284_3_a5, author = {V. V. Rybakov}, title = {A criterion for admissibility of inference rules in modal and}, journal = {Doklady Akademii Nauk}, pages = {538--541}, publisher = {mathdoc}, volume = {284}, number = {3}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_3_a5/} }
V. V. Rybakov. A criterion for admissibility of inference rules in modal and. Doklady Akademii Nauk, Tome 284 (1985) no. 3, pp. 538-541. http://geodesic.mathdoc.fr/item/DAN_1985_284_3_a5/