TY  - JOUR
AU  - V. Koubek
TI  - Universal expansion of semigroup varieties by regular involution.
JO  - Semigroup forum
PY  - 1993
SP  - 152
EP  - 159
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__46_1_135227/
ID  - SF_1993__46_1_135227
ER  -