@misc{indiciaee31c8c79ec6d,
  title = {Phonon dynamics.},
  author = {J Schwinger},
  year = {1990},
  doi = {10.1073/pnas.87.21.8370},
  url = {https://pubmed.ncbi.nlm.nih.gov/11607111/},
  note = {Source identifier: 11607111}
}