@misc{indiciaeebfac1946bde,
  title = {Supernova remnants and diffuse ionized gas in M31},
  author = {Walterbos, Rene and Braun, Robert},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910004866},
  note = {Source identifier: 19910004866}
}