%0 Journal Article
%A J. Pym
%T Affine semigroups and second duals.
%J Semigroup forum
%D 1993
%P 130-132
%V 47
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1993__47_2_135263/
%F SF_1993__47_2_135263