@article{11479,
  author = {David Hummer and G. Rybicki},
  title = {Redshifted Line Profiles from Differentially Expanding Atmospheres},
  year = {1968},
  journal = {The Astrophysical Journal},
  volume = {153},
  pages = {L107},
  month = {Jan-07-1968},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1968ApJ...153L.107H},
  doi = {10.1086/180231},
}