@article{3300,
author = {Figallo, Aldo V.},
title = {On the congruences in four-valued modal algebras},
journal = {Portugaliae mathematica},
volume = {49},
year = {1992},
pages = {249-261},
zbl = {0787.03060},
mrnumber = {1201977},
language = {en},
url = {http://dml.mathdoc.fr/item/3300}
}
Figallo, Aldo V. On the congruences in four-valued modal algebras. Portugaliae mathematica, Tome 49 (1992) pp. 249-261. http://gdmltest.u-ga.fr/item/3300/