%0 Journal Article
%A B. L. Livshits
%T Perturbation theory for a simple structure operator
%J Doklady Akademii Nauk
%D 1960
%P 800-803
%V 133
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1960_133_4_a16/
%G ru
%F DAN_1960_133_4_a16