@misc{indiciae99fd7b12ef0a,
  title = {X-ray variability of quasars},
  author = {Zamorani, G. and Maccacaro, T. and Giommi, P. and Tananbaum, H.},
  year = {1984},
  url = {https://ntrs.nasa.gov/citations/19840044866},
  note = {Source identifier: 19840044866}
}