TY  - JOUR
AU  - V. A. Pliss
TI  - On the existence of a family of periodic solutions for a system of differential equations in case of zero roots
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 17
EP  - 24
VL  - 1
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_1_a2/
LA  - ru
ID  - DE_1965_1_1_a2
ER  -