TY  - JOUR
AU  - R. Gajewski
TI  - Some theorems concerning approximation by double orthogonal series
JO  - Commentationes Mathematicae
PY  - 1984
SP  -  245
EP  - 255
VL  - 24
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v24i2.6096/
DO  - 10.14708/cm.v24i2.6096
LA  - pl
ID  - 10_14708_cm_v24i2_6096
ER  -