@misc{indiciae31d861f822a0,
  title = {Active galactic nuclei make the cosmic X-ray background},
  author = {Zdziarski, Andrzej A. and Zycki, Piotr T. and Krolik, Julian H.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930072112},
  note = {Source identifier: 19930072112}
}