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Periodic solutions of indefinite planar systems with asymmetric nonlinearities via rotation numbers |
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| Authors: | Chunlian Liu Shuang Wang |
| Affiliation: | 1. School of Science, Nantong University, Nantong, 226019 China;2. School of Mathematics and Statistics, Yancheng Teachers University, Yancheng, 224051 China |
| Abstract: | |
| Keywords: | asymmetric non-resonance periodic solutions rotation numbers |