TY  - JOUR
AU  - W. Li
TI  - The monoid of strong endomorphisms of a graph.
JO  - Semigroup forum
PY  - 1994
SP  - 143
EP  - 150
VL  - 49
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1994__49_2_135343/
ID  - SF_1994__49_2_135343
ER  -