@article{1183354818,
author = {Emch, Arnold F.},
title = {Deducibility with Respect to Necessary and Impossible Propositions},
journal = {J. Symbolic Logic},
volume = {2},
number = {2},
year = {1937},
pages = { 78-81},
language = {en},
url = {http://dml.mathdoc.fr/item/1183354818}
}
Emch, Arnold F. Deducibility with Respect to Necessary and Impossible Propositions. J. Symbolic Logic, Tome 2 (1937) no. 2, pp. 78-81. http://gdmltest.u-ga.fr/item/1183354818/