%0 Journal Article
%A P.G. Trotter
%T A class of semigroups embeddable in groups.
%J Semigroup forum
%D 1972
%P 1-13
%V 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1972__5_133920/
%F SF_1972__5_133920