%0 Journal Article
%A H. H. Pu
%A H. W. Pu
%T An approximative generalization of Zahorski's theorem on derivative
%J Colloquium Mathematicum
%D 1978
%P 81-86
%V 39
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-39-1-81-86/
%R 10.4064/cm-39-1-81-86
%G en
%F 10_4064_cm_39_1_81_86