To cite package ‘propopbirth’ in publications use:

  Rosin K, Lorenz F, Efosa N (2025). _propopbirth: Birth rate forecast
  based on the FSO methodology_. R package version 0.1.0,
  <https://github.com/statistik-aargau/propopbirth>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {propopbirth: Birth rate forecast based on the FSO methodology},
    author = {Klemens Rosin and Felix Lorenz and Norah Efosa},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://github.com/statistik-aargau/propopbirth},
  }