%0 Journal Article
%A V. O. Mishchenko
%T Expansion in eigenfunctions of a symmetric abstract elliptic differential operator
%J Differencialʹnye uravneniâ
%D 1980
%P 1474-1483
%V 16
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_8_a13/
%G ru
%F DE_1980_16_8_a13