@article{1093891494,
author = {Englebretsen, George},
title = {A note on contrariety.},
journal = {Notre Dame J. Formal Logic},
volume = {15},
number = {1},
year = {1974},
pages = { 613-614},
language = {en},
url = {http://dml.mathdoc.fr/item/1093891494}
}
Englebretsen, George. A note on contrariety.. Notre Dame J. Formal Logic, Tome 15 (1974) no. 1, pp. 613-614. http://gdmltest.u-ga.fr/item/1093891494/