@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/