@misc{indiciaeab220c40235a,
  title = {The extended X-ray source at M87.},
  author = {Kellogg, E. and Gursky, H. and Tananbaum, H. and Giacconi, R. and Pounds, K.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720049469},
  note = {Source identifier: 19720049469}
}