To cite polykde in publications use:

  García-Portugués, E. (2025). polykde: Polyspherical Kernel Density
  Estimation. R package version 1.0.0.
  https://CRAN.R-project.org/package=polykde

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{polykde}: Polyspherical Kernel Density Estimation},
    author = {Eduardo García-Portugués},
    year = {2025},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=polykde},
  }

  García-Portugués, E. and Meilán-Vila, A. (2024). Kernel density
  estimation with polyspherical data and its applications.
  arXiv:2411.04166. https://doi.org/10.48550/arXiv.2411.04166

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Kernel density estimation with polyspherical data and its applications},
    author = {Eduardo García-Portugués and Andrea Meilán-Vila},
    journal = {arXiv:2411.04166},
    year = {2024},
    url = {https://doi.org/10.48550/arXiv.2411.04166},
  }