@inproceedings{Väisänen:2021Ki,
  author = "Väisänen, Pauli  and  Usoskin, Ilya  and  Mursula, Kalevi",
  title = "{Quality survey of Neutron Monitor data sources for 1951-2019}",
  doi = "10.22323/1.395.1244",
  booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)",
  year = 2021,
  volume = "395",
  pages = "1244"
}