@misc{indiciaea3dada19d20c,
  title = {Evolution operator for a multilevel system in a continuous-wave laser field.},
  author = {GF Thomas},
  year = {1987},
  doi = {10.1103/physreva.35.4238},
  url = {https://pubmed.ncbi.nlm.nih.gov/9898013/},
  note = {Source identifier: 9898013}
}