@misc{indiciae0ac9142465c5,
  title = {Time-dependent collisional approximations for two-level systems.},
  author = {ME Crenshaw and CD Cantrell},
  year = {1989},
  doi = {10.1103/physreva.39.5705},
  url = {https://pubmed.ncbi.nlm.nih.gov/9901153/},
  note = {Source identifier: 9901153}
}