@article{1093888014,
author = {Facione, Peter A.},
title = {The entailment operator.},
journal = {Notre Dame J. Formal Logic},
volume = {18},
number = {1},
year = {1977},
pages = { 415-420},
language = {en},
url = {http://dml.mathdoc.fr/item/1093888014}
}
Facione, Peter A. The entailment operator.. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 415-420. http://gdmltest.u-ga.fr/item/1093888014/