TY  - JOUR
AU  - E. A. Andronova
TI  - Partition of the parameter space of a quadratic system with a triple focus or a center at the origin
JO  - Differencialʹnye uravneniâ
PY  - 1998
SP  - 441
EP  - 450
VL  - 34
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1998_34_4_a1/
LA  - ru
ID  - DE_1998_34_4_a1
ER  -