@inproceedings{jianlian2016products,
title={Products of positive semi-definite matrices},
author={Jianlian Cui, Chi-KwongLi, and Nung-SingSze},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161125162029329702642},
booktitle={Linear Algebra and its Applications},
year={2016},
}

Jianlian Cui, Chi-KwongLi, and Nung-SingSze. Products of positive semi-definite matrices. 2016. In Linear Algebra and its Applications. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161125162029329702642.