%0 Journal Article
%A I. I. Ibragimov
%T Extremum problems in the class of trigonometric polynomials
%J Doklady Akademii Nauk
%D 1958
%P 415-417
%V 121
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a4/
%G ru
%F DAN_1958_121_3_a4