%0 Journal Article
%A B. A. Vostretsov
%A A. V. Ignat'eva
%T The existence in the $L_p$ metric of the best approximation of functions by sums of a finite number of plane waves of given directions
%J Doklady Akademii Nauk
%D 1967
%P 1225-1228
%V 176
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_176_6_a3/
%G ru
%F DAN_1967_176_6_a3