To cite package ‘longitree’ in publications use:

  Obata R, Sugimoto T (2026). “A decision tree analysis for
  longitudinal measurement data and its applications.” _Advances in
  Data Analysis and Classification_. doi:10.1007/s11634-025-00665-2
  <https://doi.org/10.1007/s11634-025-00665-2>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A decision tree analysis for longitudinal measurement data and its applications},
    author = {Ryoto Obata and Tomoyuki Sugimoto},
    journal = {Advances in Data Analysis and Classification},
    year = {2026},
    doi = {10.1007/s11634-025-00665-2},
  }