%0 Journal Article
%A R. I. Bogdanov
%T Modules of $C^\infty$-orbital normal forms for singular points of vector fields on a plane
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1977
%P 57-58
%V 11
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1977_11_1_a6/
%G ru
%F FAA_1977_11_1_a6