To cite package ‘formulops’ in publications use:

  Denney B (2025). _formulops: Mathematical Operations on R Formula_. R
  package version 0.5.1, <https://github.com/humanpred/formulops>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {formulops: Mathematical Operations on R Formula},
    author = {Bill Denney},
    year = {2025},
    note = {R package version 0.5.1},
    url = {https://github.com/humanpred/formulops},
  }