@inproceedings{keshab2018an,
title={An angle between intermediate subfactors and its rigidity},
author={Keshab Chandra Bakshi, Sayan Das, Zhengwei Liu, and Yunxiang Ren},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220703160247569804534},
booktitle={Transactions of the American Mathematical Society},
volume={371},
pages={5973-5991},
year={2018},
}

Keshab Chandra Bakshi, Sayan Das, Zhengwei Liu, and Yunxiang Ren. An angle between intermediate subfactors and its rigidity. 2018. Vol. 371. In Transactions of the American Mathematical Society. pp.5973-5991. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220703160247569804534.