@misc{indiciaeb52ebf687aa1,
  title = {The Einstein observatory medium sensitivity survey - The quasars sample},
  author = {Gioia, I. M. and Maccacaro, T.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19850031157},
  note = {Source identifier: 19850031157}
}