@article{1093882657,
author = {Dumitriu, Anton},
title = {Necessary and contingent deduction.},
journal = {Notre Dame J. Formal Logic},
volume = {20},
number = {1},
year = {1979},
pages = { 525-534},
language = {en},
url = {http://dml.mathdoc.fr/item/1093882657}
}
Dumitriu, Anton. Necessary and contingent deduction.. Notre Dame J. Formal Logic, Tome 20 (1979) no. 1, pp. 525-534. http://gdmltest.u-ga.fr/item/1093882657/