@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/