%0 Journal Article
%A F.W. Roush
%A K.H. Kim
%T On the ...-class of a product.
%J Semigroup forum
%D 1979
%P 93-94
%V 18
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1979__18_134345/
%F SF_1979__18_134345