| Volume 1, Number 1, 2011, Pages 143-153 DOI：10.11948/2011009 |
| A study on Zoladek's example |
| Pei Yu,Maoan Han |
| Keywords: |
| Abstract: |
| In this paper, we consider an example of third-order polynomial planar system, proposed by Zoladek who claimed that this example had eleven small-amplitude limit cycles around a center. We use focus value computation to show that for this example there may exist maximal nine small-amplitude limit cycles around the center due to Hopf bifurcation. |
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