TY  - JOUR
AU  - V. V. Amel'kin
TI  - The periodic solutions of a certain system with a small parameter
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 1720
EP  - 1723
VL  - 4
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_9_a18/
LA  - ru
ID  - DE_1968_4_9_a18
ER  -