@inproceedings{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",
  booktitle = "Proceedings of Accretion Processes in Cosmic Sources  – II {\textemdash} PoS(APCS2018)",
  year = 2019,
  volume = "342",
  pages = "042"
}