%0 Journal Article
%A G. V. Radzievskii
%T Multiple completeness of root vectors of a~Keldysh pencil perturbed by an operator-valued function analytic in a~disc
%J Sbornik. Mathematics
%D 1973
%P 323-347
%V 20
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1973_20_3_a1/
%G en
%F SM_1973_20_3_a1