@article{GDZPPN00124793X,
title = {A class of congruences on a posemigroup.},
journal = {Semigroup forum},
volume = {2},
year = {1971},
pages = {173-179},
url = {http://dml.mathdoc.fr/item/GDZPPN00124793X}
}
O'Carroll, L. A class of congruences on a posemigroup.. Semigroup forum, Tome 2 (1971) pp. 173-179. http://gdmltest.u-ga.fr/item/GDZPPN00124793X/