The core congruence on a monoid.
Nico, W.R.
Semigroup forum, Tome 16 (1978), p. 141-146 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1978-01-01
EUDML-ID : urn:eudml:doc:134283 
@article{GDZPPN001252739,
     title = {The core congruence on a monoid.},
     journal = {Semigroup forum},
     volume = {16},
     year = {1978},
     pages = {141-146},
     zbl = {0389.20055},
     url = {http://dml.mathdoc.fr/item/GDZPPN001252739}
}

Nico, W.R. The core congruence on a monoid.. Semigroup forum, Tome 16 (1978) pp. 141-146. http://gdmltest.u-ga.fr/item/GDZPPN001252739/