%0 Journal Article %A S. N. Mukhopadhyay %T On Dini derivatives and on certain classes of Zahorski %J Colloquium Mathematicum %D 1972 %P 105-111 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-25-1-105-111/ %R 10.4064/cm-25-1-105-111 %G en %F 10_4064_cm_25_1_105_111