TY  - JOUR
AU  - Yu. A. Konyaev
TI  - On the existence of periodic solutions of some systems of differential equations with a small parameter at the derivative
JO  - Doklady Akademii Nauk
PY  - 1982
SP  - 40
EP  - 44
VL  - 264
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1982_264_1_a8/
LA  - ru
ID  - DAN_1982_264_1_a8
ER  -