@article{1093890892,
author = {Collier, Kenneth W.},
title = {Physical modalities and the system $E$.},
journal = {Notre Dame J. Formal Logic},
volume = {14},
number = {1},
year = {1973},
pages = { 185-194},
language = {en},
url = {http://dml.mathdoc.fr/item/1093890892}
}
Collier, Kenneth W. Physical modalities and the system $E$.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 185-194. http://gdmltest.u-ga.fr/item/1093890892/