TY  - JOUR
AU  - D.A. Bredikhin
TI  - Varieties  of groupoids associated  with involuted restrictive bisemigroups of binary relations.
JO  - Semigroup forum
PY  - 1992
SP  - 87
EP  - 92
VL  - 44
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1992__44_1_135130/
ID  - SF_1992__44_1_135130
ER  -