Kindly cite the hetu R package as follows: Pyry Kantanen, Mans Magnusson, Jussi Paananen and Leo Lahti (rOpenGov 2022). hetu: Structural Handling of Finnish Personal Identity Codes. R package version 1.0.7 URL: http://github.com/rOpenGov/hetu A BibTeX entry for LaTeX users is @Misc{, title = {hetu: Structural Handling of Finnish Personal Identity Codes}, author = {Pyry Kantanen and Mans Magnusson and Jussi Paananen and Leo Lahti}, url = {https://github.com/rOpenGov/hetu}, year = {2022}, note = {R package version 1.0.7}, } Many thanks for all contributors!