%0 Journal Article
%A E. A. Troitskaya
%T Recourse to the general theory of approximation methods in investigating the problem of determination of characteristic 

%J Doklady Akademii Nauk
%D 1957
%P 998-1001
%V 113
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_113_5_a13/
%G ru
%F DAN_1957_113_5_a13