%0 Journal Article
%A A. D. Bruno
%T Analytic invariants of a differential equation
%J Doklady Akademii Nauk
%D 1983
%P 781-785
%V 273
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a1/
%G ru
%F DAN_1983_273_4_a1