@misc{indiciaebae6925b27a9,
  title = {Knot theory and quantum gravity.},
  author = {C Rovelli and L Smolin},
  year = {1988},
  doi = {10.1103/physrevlett.61.1155},
  url = {https://pubmed.ncbi.nlm.nih.gov/10038716/},
  note = {Source identifier: 10038716}
}