@article{1183732767, author = {Lemmon, E. J.}, title = {New Foundations for Lewis Modal Systems}, journal = {J. Symbolic Logic}, volume = {22}, number = {1}, year = {1957}, pages = { 176-186}, language = {en}, url = {http://dml.mathdoc.fr/item/1183732767} }
Lemmon, E. J. New Foundations for Lewis Modal Systems. J. Symbolic Logic, Tome 22 (1957) no. 1, pp. 176-186. http://gdmltest.u-ga.fr/item/1183732767/