@article{7499,
  author = {David Hummer and G. Rybicki},
  title = {A unified treatment of escape probabilities in static and moving media. I - Plane geometry},
  year = {1982},
  journal = {The Astrophysical Journal},
  volume = {254},
  pages = {767},
  month = {Jan-03-1982},
  issn = {0004-637X},
  url = {http://articles.adsabs.harvard.edu/full/1982ApJ...254..767H},
  doi = {10.1086/159788},
}