TY  - JOUR
AU  - D. Cowan
TI  - An associative operator  on the lattice of varieties of inverse semigroups.
JO  - Semigroup forum
PY  - 1992
SP  - 288
EP  - 301
VL  - 45
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1992__45_3_135193/
ID  - SF_1992__45_3_135193
ER  -