@misc{indiciae7c7394f9880c,
  title = {An accelerated lambda iteration method for multilevel radiative transfer. I - Non-overlapping lines with background continuum},
  author = {Rybicki, G. B. and Hummer, D. G.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910056349},
  note = {Source identifier: 19910056349}
}