@misc{indiciae649b6888c327,
  title = {Wick's theorem at nonzero temperatures.},
  author = {M Revzen and JL Birman},
  year = {1994},
  doi = {10.1103/physreve.49.2688},
  url = {https://pubmed.ncbi.nlm.nih.gov/9961533/},
  note = {Source identifier: 9961533}
}