@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/