摘要：
By using the least action principle and minimax methods in critical point theory, the existence of periodic solutions for some second order discrete Hamiltonian systems is obtained.
李泳昌, 刘春根.
二阶离散哈密顿系统周期解的存在性(英文)
[J]. 南开大学学报（自然科学版）, 2023,(4): 61-.
