@article{10962,
  author = {David Hummer},
  title = {The Mean Number of Scatterings by a Resonance-Line Photon},
  year = {1964},
  journal = {The Astrophysical Journal},
  volume = {140},
  pages = {276},
  month = {Jan-10-1964},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1964ApJ...140..276H},
  doi = {10.1086/147914},
}