4 citations · 6 across the 4 of their papers we have counts for
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math.CA2017★ 1 cited
On the maximal saddle order of p:-q resonant saddle
Guangfeng Dong, Changjian Liu, Jiazhong Yang
In this paper, we obtain some estimations of the saddle order which is the sole topological invariant of the non-integrable resonant saddles of planar polynomial vector fields of a…
math.DS2017★ 4 cited
On the number of hyperelliptic limit cycles of Liénard systems
XinJie Qian, JiaZhong Yang
In this paper, we study the maximum number, denoted by , of hyperelliptic limit cycles of the Liénard systems where, respective…