@article{1200689632,
author = {Ohnishi, Masao and Matsumoto, Kazuo},
title = {Gentzen method in modal calculi. II},
journal = {Osaka Math. J.},
volume = {11},
number = {1},
year = {1959},
pages = { 115-120},
language = {en},
url = {http://dml.mathdoc.fr/item/1200689632}
}
Ohnishi, Masao; Matsumoto, Kazuo. Gentzen method in modal calculi. II. Osaka Math. J., Tome 11 (1959) no. 1, pp. 115-120. http://gdmltest.u-ga.fr/item/1200689632/