%0 Journal Article
%A P. K. Senatorov
%T The stability of the system of eigenvalues and eigenfunctions of the Sturm--Liouville problem
%J Differencialʹnye uravneniâ
%D 1971
%P 1667-1671
%V 7
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_9_a13/
%G ru
%F DE_1971_7_9_a13