@article{1183731708,
author = {Simons, Leo},
title = {New Axiomatizations of S3 and S4},
journal = {J. Symbolic Logic},
volume = {18},
number = {1},
year = {1953},
pages = { 309-316},
language = {en},
url = {http://dml.mathdoc.fr/item/1183731708}
}
Simons, Leo. New Axiomatizations of S3 and S4. J. Symbolic Logic, Tome 18 (1953) no. 1, pp. 309-316. http://gdmltest.u-ga.fr/item/1183731708/