@article{117776,
  author = {G Rybicki and David Hummer},
  title = {An accelerated lambda iteration method for multilevel radiative transfer. I. Non-overlapping lines with background continuum},
  year = {1991},
  number = {245},
  month = {1991-01-01},
  publisher = {Astronomy & Astrophysics},
  language = {en},
}