%0 Journal Article
%A M.V. Lawson
%T Congruences on ordered groupoids.
%J Semigroup forum
%D 1993
%P 150-167
%V 47
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1993__47_2_135266/
%F SF_1993__47_2_135266