%0 Journal Article
%A W.R. Nico
%T The core congruence on a monoid.
%J Semigroup forum
%D 1978
%P 141-146
%V 16
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1978__16_134283/
%F SF_1978__16_134283