TY  - JOUR
AU  - L. Polák
TI  - On varieties of completely regular semigroups II.
JO  - Semigroup forum
PY  - 1987
SP  - 253
EP  - 284
VL  - 36
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1987__36_134901/
ID  - SF_1987__36_134901
ER  -