TY  - JOUR
AU  - Higgins, Peter M.
TI  - Digraphs and the semigroup of all functions on a finite set
JO  - Glasgow mathematical journal
PY  - 1988
SP  - 41
EP  - 57
VL  - 30
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007011/
DO  - 10.1017/S0017089500007011
ID  - 10_1017_S0017089500007011
ER  -