@article{1093882663,
author = {Williamson, John},
title = {${\rm S}5$ without modal axioms.},
journal = {Notre Dame J. Formal Logic},
volume = {20},
number = {1},
year = {1979},
pages = { 593-594},
language = {en},
url = {http://dml.mathdoc.fr/item/1093882663}
}
Williamson, John. ${\rm S}5$ without modal axioms.. Notre Dame J. Formal Logic, Tome 20 (1979) no. 1, pp. 593-594. http://gdmltest.u-ga.fr/item/1093882663/