TY  - JOUR
AU  - K. Todorov
AU  - B. Bijev
TI  - Idempotent-generated subsemigroups of the symmetric semigroup of degree four: computer investigations.
JO  - Semigroup forum
PY  - 1985
SP  - 119
EP  - 122
VL  - 31
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1985__31_134740/
ID  - SF_1985__31_134740
ER  -