@misc{indiciae0680e9a26545,
  title = {Wormholes in spacetime.},
  author = {SW Hawking},
  year = {1988},
  doi = {10.1103/physrevd.37.904},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958757/},
  note = {Source identifier: 9958757}
}