%0 Journal Article
%A A. S. Markus
%A V. I. Matsaev
%T A theorem on comparison of spectra, and spectral asymptotics for a Keldysh pencil
%J Sbornik. Mathematics
%D 1985
%P 389-404
%V 51
%N 2
%U http://geodesic.mathdoc.fr/item/SM_1985_51_2_a4/
%G en
%F SM_1985_51_2_a4