@misc{indiciae2afd6c2d2954,
  title = {Quadrupole topological photonic crystals},
  author = {He, Li and Addison, Zachariah and Mele, Eugene J. and Zhen, Bo},
  year = {2020},
  doi = {10.1038/s41467-020-16916-z},
  url = {https://www.osti.gov/biblio/1647001},
  note = {Source identifier: 1647001}
}