@misc{indiciaeb5f4ec801385,
  title = {Complex geometry, quantum tunneling, and time machines.},
  author = {LX Li and JM Xu and L Liu},
  year = {1993},
  doi = {10.1103/physrevd.48.4735},
  url = {https://pubmed.ncbi.nlm.nih.gov/10016128/},
  note = {Source identifier: 10016128}
}