@misc{indiciae2e3a44ba151e,
  title = {Anderson model in thermo field dynamics: Generalized Feynman-diagram method.},
  author = {H Matsumoto and H Umezawa},
  year = {1985},
  doi = {10.1103/physrevb.31.4433},
  url = {https://pubmed.ncbi.nlm.nih.gov/9936376/},
  note = {Source identifier: 9936376}
}