@misc{indiciae799f9b298352,
  title = {On the dependence of the two-level source function on its radiation field.},
  author = {Steinitz, R. and Shine, R. A.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730057403},
  note = {Source identifier: 19730057403}
}