@article{1183731709, author = {Fitch, Frederic B.}, title = {A Simplification of Basic Logic}, journal = {J. Symbolic Logic}, volume = {18}, number = {1}, year = {1953}, pages = { 317-325}, language = {en}, url = {http://dml.mathdoc.fr/item/1183731709} }
Fitch, Frederic B. A Simplification of Basic Logic. J. Symbolic Logic, Tome 18 (1953) no. 1, pp. 317-325. http://gdmltest.u-ga.fr/item/1183731709/