To cite {tvGarchKF} package in publications use:

  Ferreira G, Arancibia T (2025). _tvGarchKF_.
  <https://github.com/Tomas-UDEC/tvGarchKF>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {tvGarchKF},
    author = {Guillermo Ferreira and Tomás Arancibia},
    year = {2025},
    url = {https://github.com/Tomas-UDEC/tvGarchKF},
  }