%0 Journal Article %A W. Li %T Green's relations on the strong endomorphism monoid of a graph. %J Semigroup forum %D 1993 %P 209-214 %V 47 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1993__47_2_135270/ %F SF_1993__47_2_135270