@inproceedings{Chen:2021cw,
  author = "Chen, Xu",
  title = "{A northern sky survey for ultra-high-energy gamma-ray source using the Tibet air-shower array and muon-detector array.}",
  doi = "10.22323/1.395.0880",
  booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)",
  year = 2021,
  volume = "395",
  pages = "880"
}