To cite package ‘lpridge’ in publications use:

  Seifert B, Maechler M (2024). _lpridge: Local Polynomial (Ridge)
  Regression_. R package version 1.1-1, ,
  <https://r-forge.r-project.org/projects/curves-etc>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {lpridge: Local Polynomial (Ridge) Regression},
    author = {Burkhardt Seifert and Martin Maechler},
    year = {2024},
    note = {R package version 1.1-1, 
},
    url = {https://r-forge.r-project.org/projects/curves-etc},
  }