%0 Journal Article
%A G. I. Natanson
%T On the theory of approximation of functions by linear combinations of Sturm--Liouville characteristic functions
%J Doklady Akademii Nauk
%D 1957
%P 263-266
%V 114
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_2_a7/
%G ru
%F DAN_1957_114_2_a7