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"A class of ninth degree system with four isochronous centers."
Chaoxiong Du, Yirong Liu, Heilong Mi (2008)
- Chaoxiong Du, Yirong Liu, Heilong Mi:
A class of ninth degree system with four isochronous centers. Comput. Math. Appl. 56(10): 2609-2620 (2008)
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