%0 Journal Article
%A M. A. Zaretskaya
%T On the spectrum of quadratic operators that are different from normal ones
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1989
%P 24-30
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1989_11_a3/
%G ru
%F IVM_1989_11_a3