To cite package ‘ppn’ in publications use:

Davis T (2026). ppn: Portable Piecepack Notation Parser. R package version 0.3.0-2, https://github.com/piecepackr/ppn.

Corresponding BibTeX entry:

  @Manual{,
    title = {ppn: Portable Piecepack Notation Parser},
    author = {Trevor L. Davis},
    year = {2026},
    note = {R package version 0.3.0-2},
    url = {https://github.com/piecepackr/ppn},
  }