%0 Journal Article
%A M. D. Kovalenko
%T Biorthogonal expansions in eigenfunctions. II
%J Differencialʹnye uravneniâ
%D 1987
%P 1948-1956
%V 23
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_11_a12/
%G ru
%F DE_1987_23_11_a12