@misc{indiciaedcc53feebd6a,
  title = {Optical-phonon modes in superlattices.},
  author = {B Zhu},
  year = {1988},
  doi = {10.1103/physrevb.38.7694},
  url = {https://pubmed.ncbi.nlm.nih.gov/9945496/},
  note = {Source identifier: 9945496}
}