%0 Journal Article
%A W. Li
%T The monoid of strong endomorphisms of a graph.
%J Semigroup forum
%D 1994
%P 143-150
%V 49
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1994__49_2_135343/
%F SF_1994__49_2_135343