@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/