@article{8475,
  author = {G. Alber and John Cooper},
  title = {Master-equation approach to collisionally induced absorption and emission},
  year = {1986},
  journal = {Physical Review A},
  volume = {33},
  pages = {3084-3112},
  month = {Jan-05-1986},
  issn = {0556-2791},
  doi = {10.1103/PhysRevA.33.3084},
}