@misc{indiciae0f65bde1aeeb,
  title = {X-ray selected quasars and Seyfert galaxies - Cosmological evolution, luminosity function, and contribution to the X-ray background},
  author = {Maccacaro, T. and Gioia, I. M. and Stocke, J. T.},
  year = {1984},
  url = {https://ntrs.nasa.gov/citations/19840065116},
  note = {Source identifier: 19840065116}
}