@misc{indiciaeb4b5a4a548a0,
  title = {Multiple-time observables in quantum theory.},
  author = {E Cohen and A Peres},
  year = {1985},
  doi = {10.1103/physrevd.31.1525},
  url = {https://pubmed.ncbi.nlm.nih.gov/9955867/},
  note = {Source identifier: 9955867}
}