%0 Journal Article
%A E. Spiegel
%T On the uniqueness of the coefficient ring in a semigroup ring.
%J Semigroup forum
%D 1987
%P 315-322
%V 36
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1987__36_134904/
%F SF_1987__36_134904