%0 Journal Article %A J. Meder %T On the estimation of Cesàro means of orthonormal series %J Annales Polonici Mathematici %D 1957 %P 183-200 %V 4 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-4-2-183-200/ %R 10.4064/ap-4-2-183-200 %G en %F 10_4064_ap_4_2_183_200