@inproceedings{Aguilar:2021OO,
  author = "Aguilar, Edilberto  and  Fraija, Nissim",
  title = "{Two-zone model as origin of hard gamma-rays spectrum in extreme BL Lacs}",
  doi = "10.22323/1.395.1007",
  booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)",
  year = 2021,
  volume = "395",
  pages = "1007"
}