@misc{indiciaea7c440524d94,
  title = {Quantum coherence and closed timelike curves.},
  author = {SW Hawking},
  year = {1995},
  doi = {10.1103/physrevd.52.5681},
  url = {https://pubmed.ncbi.nlm.nih.gov/10019100/},
  note = {Source identifier: 10019100}
}