TY  - JOUR
AU  - I. M. Vul'pe
TI  - Generalization of the averaging method of N.\,N.~Bogolyubov to certain classes of differential equations without mean values
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1973
SP  - 28
EP  - 32
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1973_12_a3/
LA  - ru
ID  - IVM_1973_12_a3
ER  -