%0 Journal Article
%A V. M. Tsodyks
%T On sets of points where the derivative is finite or infinite correspondingly
%J Doklady Akademii Nauk
%D 1957
%P 1174-1176
%V 114
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a9/
%G ru
%F DAN_1957_114_6_a9