%0 Journal Article
%A P.G. Trotter
%T Congruence-free regular semigroups with zero.
%J Semigroup forum
%D 1976
%P 1-5
%V 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1976__12_134151/
%F SF_1976__12_134151