To cite package ‘polspline’ in publications use: Kooperberg C (2024). _polspline: Polynomial Spline Routines_. R package version 1.1.25, . A BibTeX entry for LaTeX users is @Manual{, title = {polspline: Polynomial Spline Routines}, author = {Charles Kooperberg}, year = {2024}, note = {R package version 1.1.25}, url = {https://CRAN.R-project.org/package=polspline}, }