@article{1093893712,
author = {Schumm, G. F.},
title = {On a modal system of D. C. Makinson and B. Soboci\'nski.},
journal = {Notre Dame J. Formal Logic},
volume = {10},
number = {1},
year = {1969},
pages = { 263-265},
language = {en},
url = {http://dml.mathdoc.fr/item/1093893712}
}
Schumm, G. F. On a modal system of D. C. Makinson and B. Sobociński.. Notre Dame J. Formal Logic, Tome 10 (1969) no. 1, pp. 263-265. http://gdmltest.u-ga.fr/item/1093893712/