%0 Journal Article
%A V. I. Averbukh
%T Duality between differentiability and rotundity for convex functions
%J Matematičeskie zametki
%D 1974
%P 809-820
%V 15
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a17/
%G ru
%F MZM_1974_15_5_a17