@article{1093635504, author = {Lucas, Th. and Lavendhomme, R.}, title = {Varying modal theories.}, journal = {Notre Dame J. Formal Logic}, volume = {31}, number = {2}, year = {1990}, pages = { 389-402}, language = {en}, url = {http://dml.mathdoc.fr/item/1093635504} }
Lucas, Th.; Lavendhomme, R. Varying modal theories.. Notre Dame J. Formal Logic, Tome 31 (1990) no. 2, pp. 389-402. http://gdmltest.u-ga.fr/item/1093635504/