@article{1183733576,
author = {Anderson, Alan Ross and Belnap, Nuel D.},
title = {Modalities in Ackermann's "Rigorous Implication"},
journal = {J. Symbolic Logic},
volume = {24},
number = {1},
year = {1959},
pages = { 107-111},
language = {en},
url = {http://dml.mathdoc.fr/item/1183733576}
}
Anderson, Alan Ross; Belnap, Nuel D. Modalities in Ackermann's "Rigorous Implication". J. Symbolic Logic, Tome 24 (1959) no. 1, pp. 107-111. http://gdmltest.u-ga.fr/item/1183733576/