@article{1093891703, author = {Fine, Kit}, title = {Normal forms in modal logic.}, journal = {Notre Dame J. Formal Logic}, volume = {16}, number = {1}, year = {1975}, pages = { 229-237}, language = {en}, url = {http://dml.mathdoc.fr/item/1093891703} }
Fine, Kit. Normal forms in modal logic.. Notre Dame J. Formal Logic, Tome 16 (1975) no. 1, pp. 229-237. http://gdmltest.u-ga.fr/item/1093891703/