To cite RTDE in publications use:

  Dutang C (2024). _gumbel: package for Gumbel copula_. R package
  version 1.10-3, <https://CRAN.R-project.org/package=gumbel>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gumbel: package for Gumbel copula},
    author = {Christophe Dutang},
    year = {2024},
    note = {R package version 1.10-3},
    url = {https://CRAN.R-project.org/package=gumbel},
  }