TY  - JOUR
AU  - K. S. Sibirskii
TI  - Coefficient conditions for the center in the sense of Dulac of a differential system with a zero characteristic root and homogeneous nonlinearities
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 2171
EP  - 2173
VL  - 23
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_12_a25/
LA  - ru
ID  - DE_1987_23_12_a25
ER  -