To cite package ‘DER’ in publications use:

Tsagris M, Adam C (2026). DER: Income Polarization Index. R package version 1.5, https://CRAN.R-project.org/package=DER.

Corresponding BibTeX entry:

  @Manual{,
    title = {DER: Income Polarization Index},
    author = {Michail Tsagris and Christos Adam},
    year = {2026},
    note = {R package version 1.5},
    url = {https://CRAN.R-project.org/package=DER},
  }