@misc{indiciae819895365491,
  title = {Accretion disk emission from a BL Lacertae object},
  author = {Urry, C. Megan and Wandel, Amri},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910008658},
  note = {Source identifier: 19910008658}
}