@misc{indiciaea5ca49329967,
  title = {An index for two-dimensional SPT states},
  author = {Sopenko, Nikita},
  year = {2021},
  doi = {10.1063/5.0055704},
  url = {https://www.osti.gov/biblio/1901955},
  note = {Source identifier: 1901955}
}