To cite package ‘Rpcop’ in publications use:

  Frick K (2026). _Rpcop: Principal Curves of Oriented Points_. R
  package version 1.2.3, <https://github.com/kmfrick/Rpcop>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Rpcop: Principal Curves of Oriented Points},
    author = {Kevin Michael Frick},
    year = {2026},
    note = {R package version 1.2.3},
    url = {https://github.com/kmfrick/Rpcop},
  }

  Delicado P, Huerta M (2003). “Principal Curves of Oriented Points:
  theoretical and computational improvements.” _Computational
  Statistics_, *18*, 293-315. doi:10.1007/s001800300145
  <https://doi.org/10.1007/s001800300145>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Principal Curves of Oriented Points: theoretical and computational improvements},
    author = {Pedro Delicado and Mario Huerta},
    journal = {Computational Statistics},
    year = {2003},
    volume = {18},
    pages = {293--315},
    doi = {10.1007/s001800300145},
  }

  Delicado P (2001). “Another Look at Principal Curves and Surfaces.”
  _Journal of Multivariate Analysis_, *77*, 84-116.
  doi:10.1006/jmva.2000.1917 <https://doi.org/10.1006/jmva.2000.1917>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Another Look at Principal Curves and Surfaces},
    author = {Pedro Delicado},
    journal = {Journal of Multivariate Analysis},
    year = {2001},
    volume = {77},
    pages = {84--116},
    doi = {10.1006/jmva.2000.1917},
  }