@misc{indiciaeaf13cf7de453,
  title = {Second sound and characteristic temperature in solids.},
  author = {T Ruggeri and A Muracchini and L Seccia},
  year = {1996},
  doi = {10.1103/physrevb.54.332},
  url = {https://pubmed.ncbi.nlm.nih.gov/9984262/},
  note = {Source identifier: 9984262}
}