@inproceedings{Beck:201998,
  author = "Beck, Marvin  and  Arbet-Engels, Axel  and  Baack, Dominik  and  Balbo, Matteo  and  Biland, Adrian  and  Blank, Michael  and  Bretz, Thomas  and  Bruegge, Kai  and  Bulinski, Michael  and  Buss, Jens  and  Doerr, Manuel  and  Dorner, Daniela  and  Elsaesser, Dominik  and  Hildebrand, Dorothee  and  Iotov, Roman  and  Klinger, Marc  and  Mannheim, Karl  and  mueller, Sebastian  and  Neise, Dominik  and  Neronov, Andrii  and  Noethe, Maximilian  and  Paravac, Aleksander  and  Rhode, Wolfgang  and  Schleicher, Bernd  and  Sedlaczek, Kevin  and  Shukla, Amit  and  Sliusar, Vitalii  and  Tani, Laurits  and  Theissen, Fabian  and  Walter, Roland  and  von Willert, Elan",
  title = "{FACT - Probing the Periodicity of Mrk 421 and Mrk 501}",
  doi = "10.22323/1.358.0630",
  booktitle = "Proceedings of 36th International Cosmic Ray Conference {\textemdash} PoS(ICRC2019)",
  year = 2019,
  volume = "358",
  pages = "630"
}