@misc{indiciae1e2ec28dc19c,
  title = {Multiphonon theory: Wick's theorem and recursion formulas for coupled phonons.},
  author = {KV Protasov and B Silvestre-Brac and R Piepenbring and M Grinberg},
  year = {1996},
  doi = {10.1103/physrevc.53.1646},
  url = {https://pubmed.ncbi.nlm.nih.gov/9971114/},
  note = {Source identifier: 9971114}
}