TY  - JOUR
AU  - V. G. Romanovsky
TI  - Center conditions for a cubic system with four complex parameters
JO  - Differencialʹnye uravneniâ
PY  - 1995
SP  - 1091
EP  - 1093
VL  - 31
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1995_31_6_a22/
LA  - ru
ID  - DE_1995_31_6_a22
ER  -