@article{Mishev:2019Ug,
  author = "Mishev, Aleksandar  and  Usoskin, Ilya",
  title = "{Spectra of extreme GLEs derived using neutron monitor network records}",
  doi = "10.22323/1.358.1124",
  journal = "PoS",
  year = 2019,
  volume = "ICRC2019",
  pages = "1124"
}