@article{1200689157, author = {Ohnishi, Masao and Matsumoto, Kazuo}, title = {Gentzen method in modal calculi}, journal = {Osaka Math. J.}, volume = {9}, number = {1}, year = {1957}, pages = { 113-130}, language = {en}, url = {http://dml.mathdoc.fr/item/1200689157} }
Ohnishi, Masao; Matsumoto, Kazuo. Gentzen method in modal calculi. Osaka Math. J., Tome 9 (1957) no. 1, pp. 113-130. http://gdmltest.u-ga.fr/item/1200689157/