@misc{indiciaec30c1ee623dc,
  title = {Limits of X-ray variability in active galactic nuclei},
  author = {Barr, P. and Mushotzky, R. F.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19860050795},
  note = {Source identifier: 19860050795}
}