@article{01868901,
title = {A left compatible coequality relation on a semigroup with apartness.},
journal = {Novi Sad Journal of Mathematics},
volume = {29},
year = {1999},
pages = {221-234},
zbl = {1006.03037},
language = {en},
url = {http://dml.mathdoc.fr/item/01868901}
}
Romano, Daniel Abraham. A left compatible coequality relation on a semigroup with apartness.. Novi Sad Journal of Mathematics, Tome 29 (1999) pp. 221-234. http://gdmltest.u-ga.fr/item/01868901/