@inproceedings{juvensymmetric,
title={Symmetric Gapped Interfaces of SPT and SET States: Systematic Constructions},
author={Juven Wang, Xiao-Gang Wen, and Edward Witten},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20171101024434343857847},
}

Juven Wang, Xiao-Gang Wen, and Edward Witten. Symmetric Gapped Interfaces of SPT and SET States: Systematic Constructions. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20171101024434343857847.