@inproceedings{Duenkel:2021bn,
  author = "Duenkel, Fabian  and  Niechciol, Marcus  and  Risse, Markus",
  title = "{Photon decay in UHE air showers: a stringent bound on Lorentz violation}",
  doi = "10.22323/1.395.0293",
  booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)",
  year = 2021,
  volume = "395",
  pages = "293"
}