@article{5030,
  author = {David Hummer and G. Rybicki},
  title = {The Sobolev approximation for line formation with partial frequency redistribution},
  year = {1992},
  journal = {The Astrophysical Journal},
  volume = {387},
  pages = {248},
  month = {Jan-03-1992},
  issn = {0004-637X},
  url = {http://articles.adsabs.harvard.edu/full/1992ApJ...387..248H},
  doi = {10.1086/171076},
}