Four Finite Isochronous Centers in a Quartic Z3-equivariant Vector Field
WU Yusen, LIU Yirong
Acta Mathematicae Applicatae Sinica ›› 2017, Vol. 40 ›› Issue (2) : 218-228.
Four Finite Isochronous Centers in a Quartic Z3-equivariant Vector Field
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