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New existence results on periodic solutions of non-autonomous second order Hamiltonian systems |
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| Affiliation: | 1. Department of Mathematics, Nanjing University of Information Science & Technology, Nanjing 210044, PR China;2. Institute of Mathematics, School of Mathematics Sciences, Nanjing Normal University, Nanjing 210023, PR China |
| Abstract: | |
| Keywords: | Periodic solutions New saddle point theorem |
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