@misc{indiciae5756d22eff9b,
  title = {Molecular clouds in the extreme outer galaxy},
  author = {Digel, S. and De Geus, E. and Thaddeus, P.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950037254},
  note = {Source identifier: 19950037254}
}