To cite package ‘hetu’ in publications use:

Kantanen P, Bülow E, Lahtinen A, Magnusson M, Paananen J, Lahti L (2025). “Validating and Extracting Information from National Identification Numbers in R: The Case of Finland and Sweden.” The R Journal, 16, 4-14. ISSN 2073-4859. doi:10.32614/RJ-2024-023.

We strongly recommend citing the software used in research, as per FORCE11 Software citation principles:

Pyry Kantanen, Måns Magnusson, Jussi Paananen and Leo Lahti (2025). hetu: Structural Handling of Finnish Personal Identity Codes [Computer software]. R package version 1.2.0. DOI: https://doi.org/10.32614/CRAN.package.hetu

Corresponding BibTeX entries:

  @Article{RJ-2024-023,
    title = {Validating and Extracting Information from National
      Identification Numbers in R: The Case of Finland and Sweden},
    author = {Pyry Kantanen and Erik B{\"u}low and Aleksi Lahtinen and
      M{\aa}ns Magnusson and Jussi Paananen and Leo Lahti},
    year = {2025},
    doi = {10.32614/RJ-2024-023},
    journal = {The R Journal},
    volume = {16},
    issue = {3},
    issn = {2073-4859},
    pages = {4-14},
  }

  @Misc{,
    title = {hetu: Structural Handling of Finnish Personal Identity
      Codes},
    author = {Pyry Kantanen and M{\aa}ns Magnusson and Jussi Paananen
      and Leo Lahti},
    doi = {10.32614/CRAN.package.hetu},
    url = {https://github.com/rOpenGov/hetu},
    year = {2025},
    note = {R package version 1.2.0},
  }