@inproceedings{gang2016optimal,
title={Optimal lower bound for the first eigenvalue of the fourth order equation},
author={Gang Meng, and Ping Yan},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161124075443706356634},
booktitle={J. Differential Equations},
volume={261},
pages={3149–3168},
year={2016},
}
Gang Meng, and Ping Yan. Optimal lower bound for the first eigenvalue of the fourth order equation. 2016. Vol. 261. In J. Differential Equations. pp.3149–3168. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161124075443706356634.