To cite package ‘GPpenalty’ in publications use:

Mutoh A (2025). GPpenalty: Penalized Likelihood in Gaussian Processes. R package version 1.0.1, https://CRAN.R-project.org/package=GPpenalty.

Corresponding BibTeX entry:

  @Manual{,
    title = {GPpenalty: Penalized Likelihood in Gaussian Processes},
    author = {Ayumi Mutoh},
    year = {2025},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=GPpenalty},
  }