TY  - JOUR
AU  - V. A. Pliss
TI  - Families of periodic solutions of systems of differential equations of second order without dissipation
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 1428
EP  - 1448
VL  - 1
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_11_a1/
LA  - ru
ID  - DE_1965_1_11_a1
ER  -