@inproceedings{jiaqi2013the,
title={The solvability of negative Pell equation},
author={Jiaqi Wang, and Lide Cai},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160818150522468453241},
booktitle={Dongrun-Yau Science Award},
year={2013},
}