%0 Journal Article
%A V. N. Pyvovarchyk
%T Closedness of the approximate spectrum of a~polynomial operator pencil
%J Matematičeskie zametki
%D 1990
%P 147-148
%V 47
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1990_47_6_a21/
%G ru
%F MZM_1990_47_6_a21