%0 Journal Article
%A A. N. Veissenberg
%A B. I. Kushchev
%T A~certain criterion for instability in the critical case with an even number of zero roots
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1968
%P 17-20
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1968_10_a2/
%G ru
%F IVM_1968_10_a2