TY  - JOUR
AU  - V. V. Amel'kin
AU  - K. M. Al-Haider
TI  - Strong isochronism of polynomial differential systems with a center
JO  - Differencialʹnye uravneniâ
PY  - 1999
SP  - 867
EP  - 873
VL  - 35
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1999_35_7_a0/
LA  - ru
ID  - DE_1999_35_7_a0
ER  -