TY  - JOUR
AU  - W. Williams
AU  - C. Eberhart
TI  - Elementary semigroups.
JO  - Semigroup forum
PY  - 1977
SP  - 295
EP  - 310
VL  - 15
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1977__15_134261/
ID  - SF_1977__15_134261
ER  -