TY  - JOUR
AU  - B.M. Schein
TI  - On two papers of B.M. Schein.
JO  - Semigroup forum
PY  - 1981
SP  - 87
EP  - 88
VL  - 23
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1981__23_134506/
ID  - SF_1981__23_134506
ER  -