@misc{indiciae42847dadb1a9,
  title = {Time and complex numbers in canonical quantum gravity.},
  author = {JB Barbour},
  year = {1993},
  doi = {10.1103/physrevd.47.5422},
  url = {https://pubmed.ncbi.nlm.nih.gov/10015566/},
  note = {Source identifier: 10015566}
}