@misc{indiciae2342acd23877,
  title = {Model scattering envelopes of young stellar objects. II - Infalling envelopes},
  author = {Whitney, Barbara A. and Hartmann, Lee},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930037603},
  note = {Source identifier: 19930037603}
}