To cite package ‘xefun’ in publications use:

Xie S (2025). xefun: X-Engineering or Supporting Functions. R package version 0.1.6, https://github.com/shichenxie/xefun.

Corresponding BibTeX entry:

  @Manual{,
    title = {xefun: X-Engineering or Supporting Functions},
    author = {Shichen Xie},
    year = {2025},
    note = {R package version 0.1.6},
    url = {https://github.com/shichenxie/xefun},
  }