@article{11543,
  author = {M. Blaha},
  title = {Effective Gaunt Factors g_eff for Excitation of Positive Ions by Electron Collisions in a Simplified Coulomb-Born Approximation},
  year = {1969},
  journal = {The Astrophysical Journal},
  volume = {157},
  pages = {473},
  month = {Jan-08-1969},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1969ApJ...157..473B},
  doi = {10.1086/150084},
}