@article{1093894722, author = {Fitting, Melvin}, title = {Tableau methods of proof for modal logics.}, journal = {Notre Dame J. Formal Logic}, volume = {13}, number = {3}, year = {1972}, pages = { 237-247}, language = {en}, url = {http://dml.mathdoc.fr/item/1093894722} }
Fitting, Melvin. Tableau methods of proof for modal logics.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, pp. 237-247. http://gdmltest.u-ga.fr/item/1093894722/