%0 Journal Article
%A S. P. Ponomarev
%T Symmetrically differentiable functions with a perfect set of nondifferentiability points
%J Matematičeskie zametki
%D 1985
%P 80-88
%V 38
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1985_38_1_a9/
%G ru
%F MZM_1985_38_1_a9