@article{1094068840, author = {Strauss, Paul}, title = {Some systems of natural deduction.}, journal = {Notre Dame J. Formal Logic}, volume = {8}, number = {3}, year = {1967}, pages = { 286-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1094068840} }
Strauss, Paul. Some systems of natural deduction.. Notre Dame J. Formal Logic, Tome 8 (1967) no. 3, pp. 286-290. http://gdmltest.u-ga.fr/item/1094068840/