@article{1183383695, author = {Fitch, Frederic B.}, title = {Modal Functions in Two-Valued Logic}, journal = {J. Symbolic Logic}, volume = {2}, number = {2}, year = {1937}, pages = { 125-128}, language = {en}, url = {http://dml.mathdoc.fr/item/1183383695} }
Fitch, Frederic B. Modal Functions in Two-Valued Logic. J. Symbolic Logic, Tome 2 (1937) no. 2, pp. 125-128. http://gdmltest.u-ga.fr/item/1183383695/