@article{6975,
  author = {Keith Burnett and John Cooper and R. Ballagh and E. Smith},
  title = {Collisional redistribution of radiation. I. The density matrix},
  year = {1980},
  journal = {Physical Review A},
  volume = {22},
  pages = {2005-2026},
  month = {Jan-11-1980},
  issn = {0556-2791},
  doi = {10.1103/PhysRevA.22.2005},
}