@misc{indiciaeec027a3a6004,
  title = {Plasmon excitations in crystals.},
  author = {B Farid and GE Engel and R Daling and van Haeringen W},
  year = {1991},
  doi = {10.1103/physrevb.44.13349},
  url = {https://pubmed.ncbi.nlm.nih.gov/9999537/},
  note = {Source identifier: 9999537}
}