@article{106236,
author = {Jan Kraj\'\i \v cek},
title = {A possible modal reformulation of comprehension scheme},
journal = {Commentationes Mathematicae Universitatis Carolinae},
volume = {024},
year = {1983},
pages = {387-388},
language = {en},
url = {http://dml.mathdoc.fr/item/106236}
}
Krajíček, Jan. A possible modal reformulation of comprehension scheme. Commentationes Mathematicae Universitatis Carolinae, Tome 024 (1983) pp. 387-388. http://gdmltest.u-ga.fr/item/106236/
An introduction to modal logic, Methuen and Co. Ltd., 1968. (1968) | MR 0439586