@misc{indiciae5a7315929b68,
  title = {Diffused ionized gas in the spiral galaxy M31},
  author = {Walterbos, Rene A. M. and Braun, Robert},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950030857},
  note = {Source identifier: 19950030857}
}