@misc{indiciaef2be1f6f0771,
  title = {Feynman rules for response functions at thermal equilibrium.},
  author = {R Kobes},
  year = {1992},
  doi = {10.1103/physrevb.45.3230},
  url = {https://pubmed.ncbi.nlm.nih.gov/10001890/},
  note = {Source identifier: 10001890}
}