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Acknowledgments
I would like to thank sincerely Professor Jaume Llibre for inviting me to visit Centre de Recerca Matemática and to thank Professors Jaume Llibre and Ernesto Perez-Chavela for inviting me to join the HAMSYS-2014. I would like to thank sincerely the hospitality of CRM during my visit from May 26th to June 25th of 2014, and the supports from CRM and the Clay Mathematics Institute which make this visit become possible.
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Partially supported by NSFC Grant 11131004, MCME, LPMC of MOE of China, and Nankai University.
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Long, Y. Open Problem 2: Questions on the Stability Problem of Periodic Solutions in the N-Body Problem. Qual. Theory Dyn. Syst. 14, 407–408 (2015). https://doi.org/10.1007/s12346-015-0171-y
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DOI: https://doi.org/10.1007/s12346-015-0171-y