@misc{indiciae780ca68dde0e,
  title = {The Einstein Observatory extended medium sensitivity survey sample of BL Lacertae objects},
  author = {Stocke, John T. and Morris, Simon L. and Gioia, I. M. and Maccacaro, Tommaso and Schild, R. E. and Wolter, A.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19930066515},
  note = {Source identifier: 19930066515}
}