@article{1093870155,
author = {Dale, A. J.},
title = {Material equivalence and tautological entailment.},
journal = {Notre Dame J. Formal Logic},
volume = {23},
number = {3},
year = {1982},
pages = { 435-442},
language = {en},
url = {http://dml.mathdoc.fr/item/1093870155}
}
Dale, A. J. Material equivalence and tautological entailment.. Notre Dame J. Formal Logic, Tome 23 (1982) no. 3, pp. 435-442. http://gdmltest.u-ga.fr/item/1093870155/