@article{11268,
  author = {David Hummer and G. Rybicki},
  title = {Non-LTE line formation with spatial variations in the Doppler width},
  year = {1966},
  journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
  volume = {6},
  pages = {661-671},
  month = {Jan-01-1966},
  issn = {00224073},
  doi = {10.1016/0022-4073(66)90054-9},
}