@misc{indiciaec437a2c39100,
  title = {Path integrals and instantons in quantum gravity: Minisuperspace models.},
  author = {D Marolf},
  year = {1996},
  doi = {10.1103/physrevd.53.6979},
  url = {https://pubmed.ncbi.nlm.nih.gov/10019984/},
  note = {Source identifier: 10019984}
}