@misc{indiciaeeeb43bcf3157,
  title = {Quantum mechanics without time: A model.},
  author = {C Rovelli},
  year = {1990},
  doi = {10.1103/physrevd.42.2638},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013133/},
  note = {Source identifier: 10013133}
}