%0 Journal Article
%A G. P. Gubanov
%T Approximations of functions by trigonometric polynomials of the best (quadratic) approximation
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1970
%P 22-29
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1970_12_a2/
%G ru
%F IVM_1970_12_a2