TY  - JOUR
AU  - A. P. Sadovskii
TI  - Cubic Systems of Nonlinear Oscillations with Seven Limit Cycles
JO  - Differencialʹnye uravneniâ
PY  - 2003
SP  - 472
EP  - 481
VL  - 39
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2003_39_4_a4/
LA  - ru
ID  - DE_2003_39_4_a4
ER  -