@misc{indiciae75af53241294,
  title = {Path integrals, density matrices, and information flow with closed timelike curves.},
  author = {HD Politzer},
  year = {1994},
  doi = {10.1103/physrevd.49.3981},
  url = {https://pubmed.ncbi.nlm.nih.gov/10017401/},
  note = {Source identifier: 10017401}
}