@article{1093888408,
author = {Ulrich, Dolph},
title = {Semantics for ${\rm S}4.1.2$.},
journal = {Notre Dame J. Formal Logic},
volume = {19},
number = {1},
year = {1978},
pages = { 461-464},
language = {en},
url = {http://dml.mathdoc.fr/item/1093888408}
}
Ulrich, Dolph. Semantics for ${\rm S}4.1.2$.. Notre Dame J. Formal Logic, Tome 19 (1978) no. 1, pp. 461-464. http://gdmltest.u-ga.fr/item/1093888408/