%0 Journal Article
%A N. Hindman
%A J. Pym
%T Closure of singly generated subsemigroups of  S.
%J Semigroup forum
%D 1991
%P 147-154
%V 42
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1991__42_3_135073/
%F SF_1991__42_3_135073