To cite package ‘fastreg’ in publications use:

  Brødbæk S, Johnston L (2026). _fastreg: Fast Conversion and Querying
  of Danish Registers with 'Parquet'_. R package version 0.13.8,
  <https://CRAN.R-project.org/package=fastreg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fastreg: Fast Conversion and Querying of Danish Registers with 'Parquet'},
    author = {Signe Kirk Brødbæk and Luke Johnston},
    year = {2026},
    note = {R package version 0.13.8},
    url = {https://CRAN.R-project.org/package=fastreg},
  }