To cite package ‘PerRegMod’ in publications use:

  Regui S, Akharif A, Mellouk A (2024). _PerRegMod: Fitting Periodic
  Coefficients Linear Regression Models_. R package version 4.4.1,
  <https://CRAN.R-project.org/package=PerRegMod>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PerRegMod: Fitting Periodic Coefficients Linear Regression Models},
    author = {Slimane Regui and Abdelhadi Akharif and Amal Mellouk},
    year = {2024},
    note = {R package version 4.4.1},
    url = {https://CRAN.R-project.org/package=PerRegMod},
  }