@article{1093958154,
author = {Bull, R. A.},
title = {A modal extension of intuitionist logic.},
journal = {Notre Dame J. Formal Logic},
volume = {6},
number = {1},
year = {1965},
pages = { 142-146},
language = {en},
url = {http://dml.mathdoc.fr/item/1093958154}
}
Bull, R. A. A modal extension of intuitionist logic.. Notre Dame J. Formal Logic, Tome 6 (1965) no. 1, pp. 142-146. http://gdmltest.u-ga.fr/item/1093958154/