TY  - JOUR
AU  - U. Hebisch
TI  - On special Qr-filters of semigroups, semirings and rings.
JO  - Semigroup forum
PY  - 1984
SP  - 195
EP  - 210
VL  - 30
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1984__30_134715/
ID  - SF_1984__30_134715
ER  -