@article{1183735106,
author = {Parry, William Tuthill},
title = {Comments on a Variant Form of Natural Deduction},
journal = {J. Symbolic Logic},
volume = {30},
number = {1},
year = {1965},
pages = { 119-122},
language = {en},
url = {http://dml.mathdoc.fr/item/1183735106}
}
Parry, William Tuthill. Comments on a Variant Form of Natural Deduction. J. Symbolic Logic, Tome 30 (1965) no. 1, pp. 119-122. http://gdmltest.u-ga.fr/item/1183735106/