%0 Journal Article
%A V. V. Uchaikin
%A V. A. Litvinov
%T Nonlinear perturbation theory based on the variational principle: Model examples
%J Izvestiya VUZ. Applied Nonlinear Dynamics
%D 2018
%P 82-98
%V 26
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVP_2018_26_6_a7/
%G ru
%F IVP_2018_26_6_a7