TY  - JOUR
AU  - S. Schanuel
AU  - J. Isbell
TI  - Some closure properties in monoids.
JO  - Semigroup forum
PY  - 1993
SP  - 73
EP  - 77
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__46_1_135212/
ID  - SF_1993__46_1_135212
ER  -