To cite package ‘itp’ in publications use:

Northrop PJ (2026). itp: The Interpolate, Truncate, Project (ITP) Root-Finding Algorithm. R package version 1.2.2, https://github.com/paulnorthrop/itp.

Corresponding BibTeX entry:

  @Manual{,
    title = {itp: The Interpolate, Truncate, Project (ITP) Root-Finding
      Algorithm},
    author = {Paul J. Northrop},
    year = {2026},
    note = {R package version 1.2.2},
    url = {https://github.com/paulnorthrop/itp},
  }