To cite package ‘fjohansen’ in publications use:

  Roudane M (2026). _fjohansen: Johansen Cointegration Test with
  Fourier-Type Smooth Nonlinear Trends_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=fjohansen>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fjohansen: Johansen Cointegration Test with Fourier-Type Smooth Nonlinear
Trends},
    author = {Merwan Roudane},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=fjohansen},
  }