TY  - JOUR
AU  - J. Jezek
AU  - R. McKenzie
TI  - Definability in the lattice of equational  theories of semigroups.
JO  - Semigroup forum
PY  - 1993
SP  - 199
EP  - 245
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__46_1_135231/
ID  - SF_1993__46_1_135231
ER  -