@article{1093893352, author = {Cresswell, M. J.}, title = {Some proofs of relative completeness in modal logic.}, journal = {Notre Dame J. Formal Logic}, volume = {9}, number = {1}, year = {1968}, pages = { 62-66}, language = {en}, url = {http://dml.mathdoc.fr/item/1093893352} }
Cresswell, M. J. Some proofs of relative completeness in modal logic.. Notre Dame J. Formal Logic, Tome 9 (1968) no. 1, pp. 62-66. http://gdmltest.u-ga.fr/item/1093893352/