To cite package ‘cols’ in publications use:

Tsagris M (2026). cols: Constrained Ordinary Least Squares. R package version 1.7, https://CRAN.R-project.org/package=cols.

Corresponding BibTeX entry:

  @Manual{,
    title = {cols: Constrained Ordinary Least Squares},
    author = {Michail Tsagris},
    year = {2026},
    note = {R package version 1.7},
    url = {https://CRAN.R-project.org/package=cols},
  }