@article{1093957879, author = {Canty, John Thomas}, title = {A natural deduction system for modal logic.}, journal = {Notre Dame J. Formal Logic}, volume = {5}, number = {1}, year = {1964}, pages = { 199-210}, language = {en}, url = {http://dml.mathdoc.fr/item/1093957879} }
Canty, John Thomas. A natural deduction system for modal logic.. Notre Dame J. Formal Logic, Tome 5 (1964) no. 1, pp. 199-210. http://gdmltest.u-ga.fr/item/1093957879/