@article{Muraki:2023Qv,
  author = "Muraki, Yasushi",
  title = "{Proton Penetration Efficiency over Sierra Negra (Mexico) and Oulu (Finland)}",
  doi = "10.22323/1.444.1256",
  journal = "PoS",
  year = 2023,
  volume = "ICRC2023",
  pages = "1256"
}