TY  - JOUR
AU  - Z. Cybertowic
TI  - On some approximation problems
JO  - Commentationes Mathematicae
PY  - 1968
SP  -  61
EP  - 74
VL  - 12
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i1.5640/
DO  - 10.14708/cm.v12i1.5640
LA  - pl
ID  - 10_14708_cm_v12i1_5640
ER  -