most citedNonplanar Periodic Solutions for Spatial Restricted N+1-Body Problems

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math.CA2013

Periodic Solutions of Non-Autonomous Second Order Hamiltonian Systems

Fengying Li, Shiqing Zhang, Xiaoxiao Zhao

We try to generalize a result of M. Willem on forced periodic oscillations which required the assumption that the forced potential is periodic on spatial variables. In this paper,…