%0 Journal Article
%A A. A. Agrachev
%A R. V. Gamkrelidze
%T Quadratic mappings and smooth vector functions: Euler characteristics of level sets
%J Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya
%D 1989
%P 179-239
%V 35
%I mathdoc
%U http://geodesic.mathdoc.fr/item/INTD_1989_35_a3/
%G ru
%F INTD_1989_35_a3