@article{1093888509,
author = {Hazen, Allen},
title = {The eliminability of the actuality operator in propositional modal logic.},
journal = {Notre Dame J. Formal Logic},
volume = {19},
number = {1},
year = {1978},
pages = { 617-622},
language = {en},
url = {http://dml.mathdoc.fr/item/1093888509}
}
Hazen, Allen. The eliminability of the actuality operator in propositional modal logic.. Notre Dame J. Formal Logic, Tome 19 (1978) no. 1, pp. 617-622. http://gdmltest.u-ga.fr/item/1093888509/