@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/