@article{8892,
  author = {David Hummer and S. Voels},
  title = {Collisional-radiative switching: a powerful technique for converging non-LTE calculations},
  year = {1988},
  journal = {Astronomy and Astrophysics},
  volume = {192},
  pages = {279, 280},
  month = {03/1988},
  issn = {0004-6361},
  url = {http://adsabs.harvard.edu/full/1988A\%26A...192..279H},
  note = {JILA Pub. 3626},
}