%0 Journal Article
%A A. A. Agrachev
%T The topology of quadratic mappings and Hessians of smooth mappings
%J Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya 
%D 1988
%P 85-124
%V 26
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTA_1988_26_a2/
%G ru
%F INTA_1988_26_a2