@misc{indiciae13e68dd3ce45,
  title = {Classical and quantum-mechanical transition between regularity and irregularity in a Hamiltonian system.},
  author = {D Wintgen and H Friedrich},
  year = {1987},
  doi = {10.1103/physreva.35.1464},
  url = {https://pubmed.ncbi.nlm.nih.gov/9898300/},
  note = {Source identifier: 9898300}
}