To cite package ‘withinr’ in publications use:

  Fischer A, Schroeder K (2026). _withinr: High-Performance Fixed
  Effects Solver_. R package version 0.1.0,
  <https://github.com/py-econometrics/within>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {withinr: High-Performance Fixed Effects Solver},
    author = {Alexander Fischer and Kristof Schroeder},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/py-econometrics/within},
  }