TY  - JOUR
AU  - A. A. Zevin
TI  - Estimates for periodic solutions of systems of second-order nonlinear differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 932
EP  - 937
VL  - 21
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_6_a1/
LA  - ru
ID  - DE_1985_21_6_a1
ER  -