To cite package 'rclust' in publications use:

  Coraggio, Luca and Pietro Coretto (2023). Selecting the number of
  clusters, clustering models, and algorithms. A unifying approach
  based on the quadratic discriminant score. Journal of Multivariate
  Analysis, Vol. 196(105181), 1-20. url:
  https://doi.org/10.1016/j.jmva.2023.105181

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Selecting the number of clusters, clustering models, and algorithms. {A} unifying approach based on the quadratic discriminant score},
    author = {Luca Coraggio and Pietro Coretto},
    year = {2023},
    journal = {Journal of Multivariate Analysis},
    volume = {196},
    number = {105181},
    pages = {1-20},
    doi = {10.1016/j.jmva.2023.105181},
    url = {https://doi.org/10.1016/j.jmva.2023.105181},
  }

  Coraggio, Luca and Pietro Coretto (2026).  qcluster: Clustering via
  Quadratic Scoring.R package version 2.0.1url:
  https://CRAN.R-project.org/package=rclust

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {qcluster: Clustering via Quadratic Scoring},
    author = {Luca Coraggio and Pietro Coretto},
    year = {2026},
    note = {R package version 2.0.1},
  }