%0 Journal Article %A J. Meder %T On very strong Riesz-summability of orthogonal series %J Studia Mathematica %D 1961 %P 285-300 %V 20 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-20-3-285-300/ %R 10.4064/sm-20-3-285-300 %G en %F 10_4064_sm_20_3_285_300