TY  - JOUR
AU  - F. Halter-Koch
TI  - Arithmetical semigroups defined by congruences.
JO  - Semigroup forum
PY  - 1991
SP  - 59
EP  - 62
VL  - 42
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1991__42_3_135064/
ID  - SF_1991__42_3_135064
ER  -