@article{11379,
  author = {G. Rybicki and David Hummer},
  title = {Spectral Line Formation in Variable-Property Media: the Riccati Method},
  year = {1967},
  journal = {The Astrophysical Journal},
  volume = {150},
  pages = {607},
  month = {Jan-12-1967},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1967ApJ...150..607R},
  doi = {10.1086/149362},
}