%0 Journal Article %A J. Meder %T On the Nörlund summability of orthogonal series %J Annales Polonici Mathematici %D 1962 %P 231-256 %V 12 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-12-3-231-256/ %R 10.4064/ap-12-3-231-256 %G de %F 10_4064_ap_12_3_231_256