%0 Journal Article
%A F.R. McMorris
%A C.S. Johnson
%T Retractions and S-endomorphisms.
%J Semigroup forum
%D 1974
%P 84-87
%V 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1974__9_134062/
%F SF_1974__9_134062