@article{1183391408, author = {Fitch, Frederic B.}, title = {A Minimum Calculus for Logic}, journal = {J. Symbolic Logic}, volume = {9}, number = {1}, year = {1944}, pages = { 89-94}, language = {en}, url = {http://dml.mathdoc.fr/item/1183391408} }
Fitch, Frederic B. A Minimum Calculus for Logic. J. Symbolic Logic, Tome 9 (1944) no. 1, pp. 89-94. http://gdmltest.u-ga.fr/item/1183391408/