@inproceedings{qiangformulas,
title={Formulas for Partial Entanglement Entropy},
author={Qiang Wen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20200508223148968990666},
booktitle={Physical Review Research In press},
volume={1},
number={1},
pages={22},
}

Qiang Wen. Formulas for Partial Entanglement Entropy. Vol. 1. In Physical Review Research In press. pp.22. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20200508223148968990666.