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"Sufficient and Necessary Center Conditions for the Poincaré Systems ..."
Jinya Xu, Zhengyi Lu (2011)
- Jinya Xu, Zhengyi Lu:
Sufficient and Necessary Center Conditions for the Poincaré Systems P(2, 2n) (n ≤ 5). J. Appl. Math. 2011: 762762:1-762762:18 (2011)
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