TY  - JOUR
AU  - L. A. Cherkas
AU  - I. L. Shevtsov
TI  - On the Coppel Problem for Quadratic Systems with a Fine Focus
JO  - Differencialʹnye uravneniâ
PY  - 2005
SP  - 1100
EP  - 1104
VL  - 41
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2005_41_8_a10/
LA  - ru
ID  - DE_2005_41_8_a10
ER  -