To cite tvgarch in publications use:

Campos-Martins S, Sucarrat G (2024). “Modeling Nonstationary Financial Volatility with the R Package tvgarch.” Journal of Statistical Software, 108(9), 1–38. doi:10.18637/jss.v108.i09.

Corresponding BibTeX entry:

  @Article{,
    title = {Modeling Nonstationary Financial Volatility with the {R}
      Package {tvgarch}},
    author = {Susana Campos-Martins and Genaro Sucarrat},
    journal = {Journal of Statistical Software},
    year = {2024},
    volume = {108},
    number = {9},
    pages = {1--38},
    doi = {10.18637/jss.v108.i09},
  }