TY  - JOUR
AU  - A. A. Zevin
TI  - Estimates of periodic solutions of second-order nonlinear differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1982
SP  - 1673
EP  - 1679
VL  - 18
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1982_18_10_a2/
LA  - ru
ID  - DE_1982_18_10_a2
ER  -