%0 Journal Article
%A P. V. Popov
%T Variational principles for the spectrum of nonselfadjoint operators
%J Doklady Akademii Nauk
%D 1973
%P 1290-1292
%V 208
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1973_208_6_a7/
%G ru
%F DAN_1973_208_6_a7