@misc{indiciae11a2b71b2078,
  title = {Optical and radio variability in blazars},
  author = {Hufnagel, Beth R. and Bregman, Joel N.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920041622},
  note = {Source identifier: 19920041622}
}