@misc{indiciae7516ceea27ce,
  title = {Driven Rydberg atoms reveal quartic level repulsion.},
  author = {K Sacha and J Zakrzewski},
  year = {2001},
  doi = {10.1103/physrevlett.86.2269},
  url = {https://pubmed.ncbi.nlm.nih.gov/11289906/},
  note = {Source identifier: 11289906}
}