@misc{indiciaebb11ff40b9bf,
  title = {Solving the phonon Boltzmann equation with the variational method.},
  author = {S Pettersson},
  year = {1991},
  doi = {10.1103/physrevb.43.9238},
  url = {https://pubmed.ncbi.nlm.nih.gov/9996594/},
  note = {Source identifier: 9996594}
}