To cite pep725 in publications use:

  Templ M, Templ B (2026). “Enhancing Reproducibility in Phenology
  Research: The pep725 R Package for Quality-Aware Analysis of PEP725
  Data.” _New Phytologist_. doi:10.1111/nph.70869
  <https://doi.org/10.1111/nph.70869>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Enhancing Reproducibility in Phenology Research: The {pep725} {R} Package for Quality-Aware Analysis of {PEP725} Data},
    author = {Matthias Templ and Barbara Templ},
    journal = {New Phytologist},
    year = {2026},
    doi = {10.1111/nph.70869},
  }

For the underlying PEP725 database, also cite:

  Templ B, Koch E, Bolmgren K, Markus U, Paul A, Scheifinger H,
  Rutishauser T, Busto M, Chmielewski F, Lenka H, Sabina H, Kaspar F,
  Pietragalla B, Romero-Fresneda R, Tolvanen A, Vi\u{0161}nja V,
  Zimmermann K, Zust A (2018). “Pan European Phenological database
  (PEP725): a single point of access for European data.” _International
  Journal of Biometeorology_, *62*, 1109-1113.
  \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1007/s00484-018-1512-8")}.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Pan {European} Phenological database ({PEP725}): a single point of access for {European} data},
    author = {Barbara Templ and Elisabeth Koch and Kjell Bolmgren and Ungersb\u{00f6}ck Markus and Anita Paul and Helfried Scheifinger and This Rutishauser and Montserrat Busto and Frank-M. Chmielewski and H\u{00e1}jkov\u{00e1} Lenka and Hod\u{017e}i\u{0107} Sabina and Frank Kaspar and Barbara Pietragalla and Ramiro Romero-Fresneda and Anne Tolvanen and Vu\u{010d}eti\u{0107} Vi\u{0161}nja and Kirsten Zimmermann and Ana Zust},
    journal = {International Journal of Biometeorology},
    year = {2018},
    volume = {62},
    pages = {1109--1113},
    doi = {10.1007/s00484-018-1512-8},
  }