@article{1093958561, author = {Resnik, Michael D.}, title = {A note on natural deduction.}, journal = {Notre Dame J. Formal Logic}, volume = {7}, number = {1}, year = {1966}, pages = { 206-208}, language = {en}, url = {http://dml.mathdoc.fr/item/1093958561} }
Resnik, Michael D. A note on natural deduction.. Notre Dame J. Formal Logic, Tome 7 (1966) no. 1, pp. 206-208. http://gdmltest.u-ga.fr/item/1093958561/