@misc{indiciaeec1894646575,
  title = {Semiclassical path-integral quantization of nonintegrable Hamiltonian systems.},
  author = {D Wintgen},
  year = {1988},
  doi = {10.1103/physrevlett.61.1803},
  url = {https://pubmed.ncbi.nlm.nih.gov/10038902/},
  note = {Source identifier: 10038902}
}