@inproceedings{Li:2023SQ,
  author = "Li, Chaoming",
  title = "{X-ray observation of HESS J1809-193: indication of an X-ray halo and implication for its gamma-ray origin}",
  doi = "10.22323/1.444.0561",
  booktitle = "Proceedings of 38th International Cosmic Ray Conference {\textemdash} PoS(ICRC2023)",
  year = 2023,
  volume = "444",
  pages = "561"
}