TY  - JOUR
AU  - A. G. Kolpakov
TI  - Averaging in a second-order differential equation
JO  - Differencialʹnye uravneniâ
PY  - 1982
SP  - 1680
EP  - 1684
VL  - 18
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1982_18_10_a3/
LA  - ru
ID  - DE_1982_18_10_a3
ER  -