%0 Journal Article
%A P.M. Higgins
%T Dense subsets of some common classes of semigroups.
%J Semigroup forum
%D 1986
%P 5-20
%V 34
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1986__34_134827/
%F SF_1986__34_134827