To cite circularKDE in publications use:

  Zamecnik, S., Hórová, I., Hasilová, K., & Katina, S. (2024).
  circularKDE: Recent Methods for Kernel Density Estimation of Circular
  Data. R package version 0.2.4. URL
  https://github.com/stazam/circularKDE

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {circularKDE: Recent Methods for Kernel Density Estimation of Circular Data},
    author = {Stanislav Zamecnik and Ivanka Hórová and Kamila Hasilová and Stanislav Katina},
    year = {2024},
    note = {R package version 0.2.4},
    url = {https://github.com/stazam/circularKDE},
  }

  Zámečník, S., Horová, I., Katina, S., & Hasilová, K. (2024). An
  adaptive method for bandwidth selection in circular kernel density
  estimation. Computational Statistics. doi:10.1007/s00180-023-01401-0

A BibTeX entry for LaTeX users is

  @Article{,
    title = {An adaptive method for bandwidth selection in circular kernel density estimation},
    author = {Stanislav Zámečník and Ivanka Horová and Stanislav Katina and Kamila Hasilová},
    journal = {Computational Statistics},
    year = {2024},
    doi = {10.1007/s00180-023-01401-0},
  }

  Hasilová, K., Horová, I., Valis, D., & Zámečník, S. (2024). A
  comprehensive exploration of complete cross-validation for circular
  data. Statistics in Transition New Series, 25(3):1--12.
  doi:10.59170/stattrans-2024-024

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A comprehensive exploration of complete cross-validation for circular data},
    author = {Kamila Hasilová and Ivanka Horová and David Valis and Stanislav Zámečník},
    journal = {Statistics in Transition New Series},
    volume = {25},
    number = {3},
    pages = {1--12},
    year = {2024},
    doi = {10.59170/stattrans-2024-024},
  }

  Tenreiro, C. (2022). Kernel density estimation for circular data: a
  Fourier series-based plug-in approach for bandwidth selection.
  Journal of Nonparametric Statistics, 34(2):377--406.
  doi:10.1080/10485252.2022.2057974

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Kernel density estimation for circular data: a Fourier series-based plug-in approach for bandwidth selection},
    author = {Carlos Tenreiro},
    journal = {Journal of Nonparametric Statistics},
    volume = {34},
    number = {2},
    pages = {377--406},
    year = {2022},
    doi = {10.1080/10485252.2022.2057974},
  }

  Tsuruta, Y., & Sagae, M. (2017). Higher order kernel density
  estimation on the circle. Statistics & Probability Letters,
  131:46--50. doi:10.1016/j.spl.2017.08.003

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Higher order kernel density estimation on the circle},
    author = {Yasuhito Tsuruta and Masahiko Sagae},
    journal = {Statistics & Probability Letters},
    volume = {131},
    pages = {46--50},
    year = {2017},
    doi = {10.1016/j.spl.2017.08.003},
  }