%0 Journal Article
%A S. M. Ponomarev
%T A generalization of the theorem of M.\,V.~Keldy{\v s} on the completeness of the eigen- and associated functions of the first boundary value problem for a nonselfadjoint elliptic operator
%J Differencialʹnye uravneniâ
%D 1974
%P 2294-2296
%V 10
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_12_a20/
%G ru
%F DE_1974_10_12_a20