%0 Journal Article
%A V. M. Eni
%T Stability of the root-number of an analytic operator-function and on perturbations of its characteristic numbers and eigenvectors
%J Doklady Akademii Nauk
%D 1967
%P 1251-1254
%V 173
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a4/
%G ru
%F DAN_1967_173_6_a4