TY  - JOUR
AU  - L. S. Pontryagin
AU  - L. V. Rodygin
TI  - Periodic solution of a system of ordinary differential equations with a small parameter in the terms containing derivatives
JO  - Doklady Akademii Nauk
PY  - 1960
SP  - 537
EP  - 540
VL  - 132
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1960_132_3_a13/
LA  - ru
ID  - DAN_1960_132_3_a13
ER  -