@article{1183735418, author = {Lemmon, E. J.}, title = {Algebraic Semantics for Modal Logics II}, journal = {J. Symbolic Logic}, volume = {31}, number = {1}, year = {1966}, pages = { 191-218}, language = {en}, url = {http://dml.mathdoc.fr/item/1183735418} }
Lemmon, E. J. Algebraic Semantics for Modal Logics II. J. Symbolic Logic, Tome 31 (1966) no. 1, pp. 191-218. http://gdmltest.u-ga.fr/item/1183735418/