@article{Hattori:2016ZD,
  author = "Hattori, Hironori  and  Kobayashi, Tatsuo  and  Omoto, Naoya  and  Seto, Osamu",
  title = "{Dilution of axion dark radiation}",
  doi = "10.22323/1.234.0399",
  journal = "PoS",
  year = 2016,
  volume = "EPS-HEP2015",
  pages = "399"
}