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"Existence of periodic orbits for planar differential systems with delay angle."
Haihua Liang, Jianfeng Huang, Yulin Zhao (2022)
- Haihua Liang, Jianfeng Huang, Yulin Zhao:
Existence of periodic orbits for planar differential systems with delay angle. Appl. Math. Lett. 133: 108276 (2022)

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