TY  - JOUR
AU  - Günter Lettl
TI  - Subsemigroups of Finitely Generated Groups with Divisor-Theory.
JO  - Monatshefte für Mathematik
PY  - 1988
SP  - 205
EP  - 210
VL  - 106
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MOMA_1988__106_1_178401/
ID  - MOMA_1988__106_1_178401
ER  -