%0 Journal Article
%A V. N. Gol'dberg
%T Perturbation of linear operators with a purely discrete spectrum
%J Doklady Akademii Nauk
%D 1957
%P 643-645
%V 115
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a1/
%G ru
%F DAN_1957_115_4_a1