@article{Usoskin:20161U,
  author = "Usoskin, Ilya  and  Ibragimov, Askar  and  Shea, Margaret A.  and  Smart, Don",
  title = "{Database of Ground Level Enhancements (GLE) of High Energy Solar Proton Events }",
  doi = "10.22323/1.236.0054",
  journal = "PoS",
  year = 2016,
  volume = "ICRC2015",
  pages = "054"
}