To cite package ‘ewp’ in publications use:

  Boersch-Supan P, Clarke J (2024). _ewp: An Empirical Model for
  Underdispersed Count Data_. R package version 0.1.1,
  <https://CRAN.R-project.org/package=ewp>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ewp: An Empirical Model for Underdispersed Count Data},
    author = {Philipp Boersch-Supan and James Clarke},
    year = {2024},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=ewp},
  }