TY  - JOUR
AU  - E. Spiegel
TI  - On the uniqueness of the coefficient ring in a semigroup ring.
JO  - Semigroup forum
PY  - 1987
SP  - 315
EP  - 322
VL  - 36
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1987__36_134904/
ID  - SF_1987__36_134904
ER  -