To cite package ‘LPCM’ in publications use:

  Einbeck J, Evers L (2024). _LPCM: Local Principal Curve Methods_. R
  package version 0.47-6, <https://CRAN.R-project.org/package=LPCM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {LPCM: Local Principal Curve Methods},
    author = {Jochen Einbeck and Ludger Evers},
    year = {2024},
    note = {R package version 0.47-6},
    url = {https://CRAN.R-project.org/package=LPCM},
  }