@misc{indiciae207fa25a820b,
  title = {Lattice dielectric functions based on the shell model.},
  author = {H Chen and J Callaway},
  year = {1992},
  doi = {10.1103/physrevb.45.2085},
  url = {https://pubmed.ncbi.nlm.nih.gov/10001723/},
  note = {Source identifier: 10001723}
}