%0 Journal Article
%A V. I. Cherepanov
%T The parametrization method in the perturbation theory for systems with $SR$-symmetry
%J Doklady Akademii Nauk
%D 1969
%P 820-823
%V 184
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1969_184_4_a15/
%G ru
%F DAN_1969_184_4_a15