@misc{indiciaefd24bfe06a9c,
  title = {Spacetime information.},
  author = {JB Hartle},
  year = {1995},
  doi = {10.1103/physrevd.51.1800},
  url = {https://pubmed.ncbi.nlm.nih.gov/10018647/},
  note = {Source identifier: 10018647}
}