@article{11563,
  author = {T. Carson},
  title = {Ionization equilibrium with negative ion formation},
  year = {1969},
  journal = {Monthly Notices of the Royal Astronomical Society},
  volume = {142},
  chapter = {409},
  pages = {409-411},
  url = {http://articles.adsabs.harvard.edu/full/1969MNRAS.142..409C},
  doi = {10.1093/mnras/142.4.409},
  note = {JILA Pub. 438},
}