@misc{indiciae018ea55a5101,
  title = {A search for hard X-rays from extragalactic objects.},
  author = {Laros, J. G. and Matteson, J. L. and Pelling, R. M.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730036351},
  note = {Source identifier: 19730036351}
}