@article{bwmeta1.element.bwnjournal-article-bcpv9i1p341bwm,
author = {Thomason, S.},
title = {Undecidability of the completeness problem of modal logic},
journal = {Banach Center Publications},
volume = {7},
year = {1982},
pages = {341-345},
zbl = {0522.03007},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-bcpv9i1p341bwm}
}
Thomason, S. Undecidability of the completeness problem of modal logic. Banach Center Publications, Tome 7 (1982) pp. 341-345. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-bcpv9i1p341bwm/