%0 Journal Article
%A V. A. Sadovnichy
%A V. V. Dubrovskii
%T An abstract theorem of perturbation theory, regularized trace formulas, and the zeta function of operators
%J Differencialʹnye uravneniâ
%D 1977
%P 1264-1271
%V 13
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_7_a12/
%G ru
%F DE_1977_13_7_a12