TY  - JOUR
AU  - Mario Petrich
TI  - All subvarieties of a certain variety of semigroups.
JO  - Semigroup forum
PY  - 1974
SP  - 104
EP  - 152
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1974__7_134005/
ID  - SF_1974__7_134005
ER  -