TY  - JOUR
AU  - A. A. Agrachev
AU  - R. V. Gamkrelidze
TI  - Quadratic mappings and smooth vector functions: Euler characteristics of level sets
JO  - Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya
PY  - 1989
SP  - 179
EP  - 239
VL  - 35
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/INTD_1989_35_a3/
LA  - ru
ID  - INTD_1989_35_a3
ER  -