@article{1183735614, author = {Nelson, David}, title = {Non-Null Implication}, journal = {J. Symbolic Logic}, volume = {31}, number = {1}, year = {1966}, pages = { 562-572}, language = {en}, url = {http://dml.mathdoc.fr/item/1183735614} }
Nelson, David. Non-Null Implication. J. Symbolic Logic, Tome 31 (1966) no. 1, pp. 562-572. http://gdmltest.u-ga.fr/item/1183735614/