@misc{indiciae3aace408d0ed,
  title = {X-ray spectroscopy of five BL Lacertae objects},
  author = {Urry, C. M. and Mushotzky, R. F. and Holt, S. S.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860055345},
  note = {Source identifier: 19860055345}
}