@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/