@misc{indiciae2c61edcd6bac,
  title = {Analytic continuation of quantum systems and their temporal evolution.},
  author = {EC Sudarshan and CB Chiu},
  year = {1993},
  doi = {10.1103/physrevd.47.2602},
  url = {https://pubmed.ncbi.nlm.nih.gov/10015857/},
  note = {Source identifier: 10015857}
}