@article{Velinov:2019b7,
  author = "Velinov, Peter I. Y.  and  Mishev, Alexander",
  title = "{Ionization Effect in Atmosphere During Several Halloween GLE events of October-November 2003}",
  doi = "10.22323/1.358.1167",
  journal = "PoS",
  year = 2019,
  volume = "ICRC2019",
  pages = "1167"
}