%0 Journal Article
%A S. P. Alliluev
%A V. M. Vainberg
%A V. L. Eletskii
%A V. S. Popov
%T Logarithmic perturbation theory for excited levels
%J Doklady Akademii Nauk
%D 1980
%P 1392-1396
%V 254
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1980_254_6_a26/
%G ru
%F DAN_1980_254_6_a26