@inproceedings{patrizia1991precise,
title={Precise damping conditions for global asymptotic stability for nonlinear second order systems},
author={Patrizia Pucci, and James Serrin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203320201557485},
booktitle={Acta Mathematica},
volume={170},
number={2},
pages={275-307},
year={1991},
}
Patrizia Pucci, and James Serrin. Precise damping conditions for global asymptotic stability for nonlinear second order systems. 1991. Vol. 170. In Acta Mathematica. pp.275-307. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203320201557485.