@conference{11431,
  author = {David Hummer and G. Rybicki},
  title = {Line Formation in Differentially Moving Media with Temperature Gradients},
  year = {1968},
  month = {12/1968},
  publisher = {Boulder, CO: National Center for Atmospheric Research},
  address = {Boulder, Colorado},
  note = {JILA Pub. 469},
}