TY  - JOUR
AU  - V. A. Pliss
TI  - Recurrent motions of periodic systems of two differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1967
SP  - 722
EP  - 732
VL  - 3
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1967_3_5_a1/
LA  - ru
ID  - DE_1967_3_5_a1
ER  -