@article{1093891793,
author = {Hacker, Edward A.},
title = {The octagon of opposition.},
journal = {Notre Dame J. Formal Logic},
volume = {16},
number = {1},
year = {1975},
pages = { 352-353},
language = {en},
url = {http://dml.mathdoc.fr/item/1093891793}
}
Hacker, Edward A. The octagon of opposition.. Notre Dame J. Formal Logic, Tome 16 (1975) no. 1, pp. 352-353. http://gdmltest.u-ga.fr/item/1093891793/