@misc{indiciaea77dba4cd9be,
  title = {Spin networks and quantum gravity.},
  author = {C Rovelli and L Smolin},
  year = {1995},
  doi = {10.1103/physrevd.52.5743},
  url = {https://pubmed.ncbi.nlm.nih.gov/10019107/},
  note = {Source identifier: 10019107}
}