%0 Journal Article %A S. Mukhopadhyay %A S. Mitra %T An extension of a theorem of Marcinkiewicz and Zygmund on differentiability %J Fundamenta Mathematicae %D 1996 %P 21-38 %V 151 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-151-1-21-38/ %R 10.4064/fm-151-1-21-38 %G en %F 10_4064_fm_151_1_21_38