To cite package ‘DER’ in publications use: Tsagris M (2025). _DER: Income Polarization Index_. R package version 1.0, . A BibTeX entry for LaTeX users is @Manual{, title = {DER: Income Polarization Index}, author = {Michail Tsagris}, year = {2025}, note = {R package version 1.0}, url = {https://CRAN.R-project.org/package=DER}, }