@article{1183385431, author = {Churchman, C. West}, title = {On Finite and Infinite Modal Systems}, journal = {J. Symbolic Logic}, volume = {3}, number = {1}, year = {1938}, pages = { 77-82}, language = {en}, url = {http://dml.mathdoc.fr/item/1183385431} }
Churchman, C. West. On Finite and Infinite Modal Systems. J. Symbolic Logic, Tome 3 (1938) no. 1, pp. 77-82. http://gdmltest.u-ga.fr/item/1183385431/