TY  - JOUR
AU  - A. F. Filippov
TI  - The infinitesimal order of perturbations preserving the instability of a singular point
JO  - Differencialʹnye uravneniâ
PY  - 2000
SP  - 1037
EP  - 1044
VL  - 36
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2000_36_8_a3/
LA  - ru
ID  - DE_2000_36_8_a3
ER  -