@inproceedings{peter1982a,
title={A new conformal invariant and its applications to the Willmore conjecture and the first eigenvalue of compact surfaces},
author={Peter Li, and Shing-Tung Yau},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203433040378029},
booktitle={Inventiones mathematicae},
volume={69},
number={2},
pages={269-291},
year={1982},
}

Peter Li, and Shing-Tung Yau. A new conformal invariant and its applications to the Willmore conjecture and the first eigenvalue of compact surfaces. 1982. Vol. 69. In Inventiones mathematicae. pp.269-291. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203433040378029.