@misc{indiciae3aa036e17773,
  title = {Markarian 421's Unusual Satellite Galaxy},
  author = {Gorham, P. and Zee, L. and Unwin, S. and Jacobs, C.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20060040821},
  note = {Source identifier: 20060040821}
}