TY  - JOUR
AU  - L. A. Cherkas
AU  - I. S. Shchukina
TI  - On series expansion of an Andronov--Hopf manifold of a quadratic system in the plane
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 278
EP  - 282
VL  - 23
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_2_a10/
LA  - ru
ID  - DE_1987_23_2_a10
ER  -