To cite package ‘PPtreeExt’ in publications use:

  da Silva N, Cook D, Lee E (2026). _PPtreeExt: Projection Pursuit
  Classification Tree Extensions_. R package version 0.1.0,
  <https://github.com/natydasilva/pptreeext>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PPtreeExt: Projection Pursuit Classification Tree Extensions},
    author = {Natalia {da Silva} and Dianne Cook and Eun-Kyung Lee},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/natydasilva/pptreeext},
  }