@article{1183741706, author = {Schroeder-Heister, Peter}, title = {A Natural Extension of Natural Deduction}, journal = {J. Symbolic Logic}, volume = {49}, number = {1}, year = {1984}, pages = { 1284-1300}, language = {en}, url = {http://dml.mathdoc.fr/item/1183741706} }
Schroeder-Heister, Peter. A Natural Extension of Natural Deduction. J. Symbolic Logic, Tome 49 (1984) no. 1, pp. 1284-1300. http://gdmltest.u-ga.fr/item/1183741706/