@article{Fujii:2023+W,
  author = "Fujii, Shingo",
  title = "{Calibration of the integrating sphere for O4 in KAGRA gravitational wave telescope}",
  doi = "10.22323/1.444.1553",
  journal = "PoS",
  year = 2023,
  volume = "ICRC2023",
  pages = "1553"
}