%0 Journal Article %A R. Taberski %T Approximation of real functions by the double trigonometric polynomials %J Commentationes Mathematicae %D 1972 %P 113-123 %V 16 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/cm.v16i1.5729/ %R 10.14708/cm.v16i1.5729 %G pl %F 10_14708_cm_v16i1_5729