@article{Barkov:2019V9,
  author = "Barkov, Maxim  and  Khangulyan, Dmitry  and  Aharonian, Felix",
  title = "{Scenarios for Ultrafast Gamma-Ray Variability in AGN}",
  doi = "10.22323/1.342.0042",
  journal = "PoS",
  year = 2019,
  volume = "APCS2018",
  pages = "042"
}