@article{1183732820,
author = {Hiz, H.},
title = {Inferential Equivalence and Natural Deduction},
journal = {J. Symbolic Logic},
volume = {22},
number = {1},
year = {1957},
pages = { 237-240},
language = {en},
url = {http://dml.mathdoc.fr/item/1183732820}
}
Hiz, H. Inferential Equivalence and Natural Deduction. J. Symbolic Logic, Tome 22 (1957) no. 1, pp. 237-240. http://gdmltest.u-ga.fr/item/1183732820/