To cite package ‘vfunc’ in publications use:

  Hankin RKS (2026). “Introducing the vfunc R package.”
  doi:10.48550/ARXIV.2603.15156
  <https://doi.org/10.48550/ARXIV.2603.15156>.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {Introducing the vfunc {R} package},
    author = {Robin K. S. Hankin},
    year = {2026},
    publisher = {arXiv},
    doi = {10.48550/ARXIV.2603.15156},
  }