@article{1093890906, author = {G\"ardenfors, Peter}, title = {On the extensions of $S5$.}, journal = {Notre Dame J. Formal Logic}, volume = {14}, number = {1}, year = {1973}, pages = { 277-280}, language = {en}, url = {http://dml.mathdoc.fr/item/1093890906} }
Gärdenfors, Peter. On the extensions of $S5$.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 277-280. http://gdmltest.u-ga.fr/item/1093890906/