TY  - JOUR
AU  - B.M. Schein
TI  - Regular elements of the semigroup of all binary relations.
JO  - Semigroup forum
PY  - 1976
SP  - 95
EP  - 102
VL  - 13
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1976__13_134200/
ID  - SF_1976__13_134200
ER  -