%0 Journal Article
%A V. A. Gorelov
%T On the change of a finite number of elements in a system of root functions of a differential operator without loss of the basis property
%J Differencialʹnye uravneniâ
%D 1997
%P 33-38
%V 33
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1997_33_1_a5/
%G ru
%F DE_1997_33_1_a5