@article{1183389103,
author = {McKinsey, J. C. C.},
title = {Proof That There are Infinitely Many Modalities in Lewis's System $S\_2$},
journal = {J. Symbolic Logic},
volume = {5},
number = {1},
year = {1940},
pages = { 110-112},
language = {en},
url = {http://dml.mathdoc.fr/item/1183389103}
}
McKinsey, J. C. C. Proof That There are Infinitely Many Modalities in Lewis's System $S_2$. J. Symbolic Logic, Tome 5 (1940) no. 1, pp. 110-112. http://gdmltest.u-ga.fr/item/1183389103/