%0 Journal Article
%A S. I. Kadchenko
%A S. N. Kakushkin
%T The first four corrections of the perturbation theory for discrete semi bounded from below operators with free multiplicities of eigenvalues finding
%J Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie
%D 2011
%P 16-21
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VYURU_2011_9_a1/
%G ru
%F VYURU_2011_9_a1