@inproceedings{Yamamoto:2024hm,
  author = "Yamamoto, Marino  and  Kataoka, Jun  and  Sofue, Yoshiaki",
  title = "{Discovery of non-equilibrium ionization plasma around the Fermi Bubble; new evidence of past activity of the Galactic center}",
  doi = "10.22323/1.417.0124",
  booktitle = "Proceedings of 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy {\textemdash} PoS(Gamma2022)",
  year = 2024,
  volume = "417",
  pages = "124"
}