@article{Usoskin:2017T+,
  author = "Usoskin, Ilya",
  title = "{Extreme solar particle events: Can we assess the worst case scenario?}",
  doi = "10.22323/1.301.0127",
  journal = "PoS",
  year = 2017,
  volume = "ICRC2017",
  pages = "127"
}