Ching Zan Dang

Publications in Math-Net.Ru

1. Strong isochronism of the center of dynamical systems with incomplete polynomials of the third degree
   
   Differ. Uravn., 29:6 (1993),  1057–1060
2. Strong isochronism of the center of dynamical systems with second-degree polynomials
   
   Differ. Uravn., 29:5 (1993),  739–743