%0 Journal Article
%A E. A. Sevast'yanov
%T On~an~estimate for the smallness of sets of points of nondifferentiability of functions as related to the degree of approximation by rational functions
%J Izvestiya. Mathematics 
%D 1986
%P 347-369
%V 26
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1986_26_2_a5/
%G en
%F IM2_1986_26_2_a5