@article{1093635085, author = {Schumm, George F.}, title = {Some compactness results for modal logic.}, journal = {Notre Dame J. Formal Logic}, volume = {30}, number = {2}, year = {1989}, pages = { 285-290}, language = {en}, url = {http://dml.mathdoc.fr/item/1093635085} }
Schumm, George F. Some compactness results for modal logic.. Notre Dame J. Formal Logic, Tome 30 (1989) no. 2, pp. 285-290. http://gdmltest.u-ga.fr/item/1093635085/