%0 Journal Article
%A M. F. Timan
%T The best approximation of periodic functions by trigonometric polynomials, and transforms of convolution type
%J Doklady Akademii Nauk
%D 1971
%P 776-778
%V 198
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a9/
%G ru
%F DAN_1971_198_4_a9