@misc{indiciaefa3acc187b05,
  title = {Low-frequency floppy modes in beta -cristobalite.},
  author = {IP Swainson and MT Dove},
  year = {1993},
  doi = {10.1103/physrevlett.71.193},
  url = {https://pubmed.ncbi.nlm.nih.gov/10054406/},
  note = {Source identifier: 10054406}
}