@inproceedings{j.2018elliptic,
title={Elliptic operators with honeycomb symmetry: Dirac points, Edge States and Applications to Photonic Graphene},
author={J. P. Lee-Thorp, M. I. Weinstein, and Yi Zhu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220421120223791080089},
year={2018},
}

J. P. Lee-Thorp, M. I. Weinstein, and Yi Zhu. Elliptic operators with honeycomb symmetry: Dirac points, Edge States and Applications to Photonic Graphene. 2018. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220421120223791080089.