%0 Journal Article
%A V. V. Lychagin
%T Singularities of solutions, spectral sequences, and normal forms of Lie algebras of vector fields
%J Izvestiya. Mathematics 
%D 1988
%P 549-575
%V 30
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1988_30_3_a5/
%G en
%F IM2_1988_30_3_a5