@misc{indiciaeac0de97fb9a6,
  title = {Infrared activity in elemental crystals.},
  author = {R Zallen and RM Martin and V Natoli},
  year = {1994},
  doi = {10.1103/physrevb.49.7032},
  url = {https://pubmed.ncbi.nlm.nih.gov/10009432/},
  note = {Source identifier: 10009432}
}