@inproceedings{johannes1998asymptotic,
title={Asymptotic distribution of resonances for convex obstacles},
author={Johannes Sjöstrand, and Maciej Zworski},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203334846937587},
booktitle={Acta Mathematica},
volume={183},
number={2},
pages={191-253},
year={1998},
}
Johannes Sjöstrand, and Maciej Zworski. Asymptotic distribution of resonances for convex obstacles. 1998. Vol. 183. In Acta Mathematica. pp.191-253. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203334846937587.