@misc{indiciae1b386b2e5e30,
  title = {Operator method for finding new propagators from old.},
  author = {A Anderson},
  year = {1988},
  doi = {10.1103/physrevd.37.536},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958708/},
  note = {Source identifier: 9958708}
}