@article{4949,
  author = {D. Luttermoser and Hollis Johnson},
  title = {Ionization and excitation in cool giant stars. I - Hydrogen and helium},
  year = {1992},
  journal = {The Astrophysical Journal},
  volume = {388},
  pages = {579},
  month = {Jan-03-1992},
  issn = {0004-637X},
  url = {http://articles.adsabs.harvard.edu/full/1992ApJ...388..579L},
  doi = {10.1086/171175},
}