%0 Journal Article
%A M. A. Gol'dman
%A S. N. Krachkovskii
%T On the stability of some properties of a closed linear operator
%J Doklady Akademii Nauk
%D 1973
%P 769-772
%V 209
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a2/
%G ru
%F DAN_1973_209_4_a2