@article{Moraal:2016F/,
  author = "Moraal, Harm",
  title = "{The cosmic-ray ground-level enhancements of 29 September 1989 and 20 January 2005 }",
  doi = "10.22323/1.236.0046",
  journal = "PoS",
  year = 2016,
  volume = "ICRC2015",
  pages = "046"
}