%0 Journal Article
%A V. A. Il'in
%A I. Jo
%T Estimation of the difference of partial sums of expansions corresponding to two arbitrary nonnegative selfadjoint extensions of two operators of Sturm--Liouville
%J Differencialʹnye uravneniâ
%D 1979
%P 1175-1193
%V 15
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1979_15_7_a2/
%G ru
%F DE_1979_15_7_a2