@misc{indiciaef4bce2580ebc,
  title = {Luminosity function and cosmological evolution of X-ray selected quasars},
  author = {Maccacaro, T. and Gioia, I. M.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19850031180},
  note = {Source identifier: 19850031180}
}