To cite package ‘variantstring’ in publications use:

  Verity B (2025). _variantstring: Functions for working with variant
  string format_. R package version 1.7.0,
  <https://github.com/mrc-ide/variantstring>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {variantstring: Functions for working with variant string format},
    author = {Bob Verity},
    year = {2025},
    note = {R package version 1.7.0},
    url = {https://github.com/mrc-ide/variantstring},
  }