TY  - JOUR
AU  - È. I. Grudo
TI  - Periodic solutions with incommensurable periods of periodic differential systems
JO  - Differencialʹnye uravneniâ
PY  - 1986
SP  - 1499
EP  - 1504
VL  - 22
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1986_22_9_a2/
LA  - ru
ID  - DE_1986_22_9_a2
ER  -