%0 Journal Article
%A Yu. A. Kuznetsov
%A S. B. Sorokin
%T The method of two-sided approximations in eigenvalue problems
%J Differencialʹnye uravneniâ
%D 1979
%P 914-920
%V 15
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1979_15_5_a16/
%G ru
%F DE_1979_15_5_a16