@article{1093893458, author = {Ashworth, E. J.}, title = {Petrus Fonseca and material implication.}, journal = {Notre Dame J. Formal Logic}, volume = {9}, number = {1}, year = {1968}, pages = { 227-228}, language = {en}, url = {http://dml.mathdoc.fr/item/1093893458} }
Ashworth, E. J. Petrus Fonseca and material implication.. Notre Dame J. Formal Logic, Tome 9 (1968) no. 1, pp. 227-228. http://gdmltest.u-ga.fr/item/1093893458/