TY  - JOUR
AU  - R. Broeksteeg
TI  - A concept of variety for regular biordered sets.
JO  - Semigroup forum
PY  - 1994
SP  - 335
EP  - 348
VL  - 49
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1994__49_2_135358/
ID  - SF_1994__49_2_135358
ER  -