TY  - JOUR
AU  - V. V. Amel'kin
AU  - Z. D. Ching
TI  - Strong isochronism of the center of dynamical systems with incomplete polynomials of the third degree
JO  - Differencialʹnye uravneniâ
PY  - 1993
SP  - 1057
EP  - 1060
VL  - 29
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1993_29_6_a16/
LA  - ru
ID  - DE_1993_29_6_a16
ER  -