%0 Journal Article
%A J.D. Lawson
%A M. Mislove
%T Semilattices which must contain a copy of  2 N.
%J Semigroup forum
%D 1985
%P 71-78
%V 32
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1985__32_134768/
%F SF_1985__32_134768