@article{1183740950, author = {Lopez-Escobar, E.G.K.}, title = {Implicational Logics in Natural Deduction Systems}, journal = {J. Symbolic Logic}, volume = {47}, number = {1}, year = {1982}, pages = { 184-186}, language = {en}, url = {http://dml.mathdoc.fr/item/1183740950} }
Lopez-Escobar, E.G.K. Implicational Logics in Natural Deduction Systems. J. Symbolic Logic, Tome 47 (1982) no. 1, pp. 184-186. http://gdmltest.u-ga.fr/item/1183740950/