@inproceedings{a.1981forced,
title={Forced vibrations of superquadratic Hamiltonian systems},
author={A. Bahri, and H. Berestycki},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203301902976352},
booktitle={Acta Mathematica},
volume={152},
number={1},
pages={143-197},
year={1981},
}
A. Bahri, and H. Berestycki. Forced vibrations of superquadratic Hamiltonian systems. 1981. Vol. 152. In Acta Mathematica. pp.143-197. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203301902976352.