To cite package ‘haarfisz’ in publications use:

  Fryzlewicz P (2023). _haarfisz: Software to Perform Haar Fisz
  Transforms_. R package version 4.5.4,
  <https://CRAN.R-project.org/package=haarfisz>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {haarfisz: Software to Perform Haar Fisz Transforms},
    author = {Piotr Fryzlewicz},
    year = {2023},
    note = {R package version 4.5.4},
    url = {https://CRAN.R-project.org/package=haarfisz},
  }