%0 Journal Article
%A R. Gajewski
%T Some theorems concerning approximation by double orthogonal series
%J Commentationes Mathematicae
%D 1984
%P  245-255
%V 24
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v24i2.6096/
%R 10.14708/cm.v24i2.6096
%G pl
%F 10_14708_cm_v24i2_6096