TY  - JOUR
AU  - E. A. Grebenikov
TI  - Certain estimates of the method of averaging for multifrequency systems of ordinary differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 459
EP  - 473
VL  - 4
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_3_a7/
LA  - ru
ID  - DE_1968_4_3_a7
ER  -