@inproceedings{yia,
title={A useful variant of the Davis--Kahan theorem for statisticians.},
author={Yi Yu, Tengyao Wang, and Richard J. Samworth},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180607165633378717095},
booktitle={Biometrika},
volume={102},
pages={315-323},
}
Yi Yu, Tengyao Wang, and Richard J. Samworth. A useful variant of the Davis--Kahan theorem for statisticians.. Vol. 102. In Biometrika. pp.315-323. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180607165633378717095.