@article{8926,
  author = {David Hummer and D. Mihalas},
  title = {The equation of state for stellar envelopes. I - an occupation probability formalism for the truncation of internal partition functions},
  year = {1988},
  journal = {The Astrophysical Journal},
  volume = {331},
  pages = {794},
  month = {Jan-08-1988},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1988ApJ...331..794H},
  doi = {10.1086/166600},
}