@misc{indiciaee225b75f81bc,
  title = {Regular and chaotic propagators in quantum theory.},
  author = {M Feingold and A Peres},
  year = {1985},
  doi = {10.1103/physreva.31.2472},
  url = {https://pubmed.ncbi.nlm.nih.gov/9895781/},
  note = {Source identifier: 9895781}
}