@article{1183730569,
author = {Henkin, Leon},
title = {Fragments of the Propositional Calculus},
journal = {J. Symbolic Logic},
volume = {14},
number = {1},
year = {1949},
pages = { 42-48},
language = {en},
url = {http://dml.mathdoc.fr/item/1183730569}
}
Henkin, Leon. Fragments of the Propositional Calculus. J. Symbolic Logic, Tome 14 (1949) no. 1, pp. 42-48. http://gdmltest.u-ga.fr/item/1183730569/