The following publications are possibly variants of this publication:
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- New existence and multiplicity theorems of periodic solutions for non-autonomous second order Hamiltonian systemsXian Wu, Shao-Xiong Chen, Fukun Zhao. mcm, 46(3-4):550-556, 2007. [doi]
- Multiplicity of small negative-energy solutions for a class of nonlinear Schrödinger-Poisson systemsLiping Xu, Haibo Chen. amc, 243:817-824, 2014. [doi]