%0 Journal Article
%A B. T. Polyak
%A A. B. Tsybakov
%T Optimal projection estimates for a regression function of unknown
%J Doklady Akademii Nauk
%D 1989
%P 297-301
%V 304
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a8/
%G ru
%F DAN_1989_304_2_a8