TY  - JOUR
AU  - I. Levi
TI  - Transformation semigroup diagram and the ...-relation.
JO  - Semigroup forum
PY  - 1994
SP  - 138
EP  - 151
VL  - 48
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1994__48_3_135306/
ID  - SF_1994__48_3_135306
ER  -