TY  - JOUR
AU  - V. A. Lunkevich
AU  - K. S. Sibirskii
TI  - Conditions for a center in the case of homogeneous nonlinearities of third degree
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 1482
EP  - 1487
VL  - 1
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_11_a4/
LA  - ru
ID  - DE_1965_1_11_a4
ER  -