%0 Journal Article
%A G. I. Natanson
%T Certain cases when Fourier sums give best order approximation
%J Doklady Akademii Nauk
%D 1968
%P 1254-1257
%V 183
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_183_6_a4/
%G ru
%F DAN_1968_183_6_a4