The following publications are possibly variants of this publication:
- Five periodic solutions for a class of subquadratic second-order even Hamiltonian systemsHua-Xin Ou, Chun Li. appml, 133:108219, 2022. [doi]
- On the existence of minimal periodic solutions for a class of second-order Hamiltonian systemsChun Li, Zeng-Qi Ou, Dong-Lun Wu. appml, 43:44-48, 2015. [doi]
- Rotating periodic solutions for super-linear second order Hamiltonian systemsGuanggang Liu, Yong Li, Xue Yang. appml, 79:73-79, 2018. [doi]