@article{1093891013,
author = {SobociAski, BolesAaw},
title = {Modal system ${\rm S}3$ and the proper axioms of ${\rm S}4.02$ and ${\rm S}4.04$.},
journal = {Notre Dame J. Formal Logic},
volume = {14},
number = {1},
year = {1973},
pages = { 415-418},
language = {en},
url = {http://dml.mathdoc.fr/item/1093891013}
}
SobociÅski, BolesÅaw. Modal system ${\rm S}3$ and the proper axioms of ${\rm S}4.02$ and ${\rm S}4.04$.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 415-418. http://gdmltest.u-ga.fr/item/1093891013/