TY  - JOUR
AU  - E. Ambrożko
TI  - On modular filters
JO  - Commentationes Mathematicae
PY  - 1989
SP  -  1
EP  - 21
VL  - 29
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v29i1.6250/
DO  - 10.14708/cm.v29i1.6250
LA  - pl
ID  - 10_14708_cm_v29i1_6250
ER  -