TY  - JOUR
AU  - G. Marino
AU  - R. Toscano
TI  - Periodic Solutions of a Class of Nonlinear Systems of Ordinary Differential Equations
JO  - Differencialʹnye uravneniâ
PY  - 2004
SP  - 465
EP  - 476
VL  - 40
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2004_40_4_a3/
LA  - ru
ID  - DE_2004_40_4_a3
ER  -