@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/