To cite Rttf2pt1 in publications use:

Winston Chang, Andrew Weeks, Frank M. Siegert, Mark Heath, Thomas Henlick, Sergey Babkin, Turgut Uyar, Rihardas Hepas, Szalay Tamas, Johan Vromans, Petr Titera, Lei Wang, Chen Xiangyang, Zvezdan Petkovic, Rigel, I. Lee Hetherington and Frederic Bertrand (2025). 'ttf2pt1' Program, R package version 1.3.14.<doi:10.32614/CRAN.package.Rttf2pt1>.

Corresponding BibTeX entry:

  @Manual{,
    title = {'ttf2pt1' Program},
    author = {Winston Chang and Andrew Weeks and Frank M. Siegert and
      Mark Heath and Thomas Henlick and Sergey Babkin and Turgut Uyar
      and Rihardas Hepas and Szalay Tamas and Johan Vromans and Petr
      Titera and Lei Wang and Chen Xiangyang and Zvezdan Petkovic and
      {Rigel} and I. Lee Hetherington and Frederic Bertrand},
    publisher = {manual},
    year = {2025},
    note = {R package version 1.3.14},
    url = {https://github.com/fbertran/Rttf2pt1},
  }