Müllner D (2013). “fastcluster: Fast Hierarchical, Agglomerative Clustering Routines for R and Python.” Journal of Statistical Software, 53(9), 1–18. doi:10.18637/jss.v053.i09.

Corresponding BibTeX entry:

  @Article{,
    title = {{fastcluster}: Fast Hierarchical, Agglomerative Clustering
      Routines for {R} and {Python}},
    author = {Daniel Müllner},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {53},
    number = {9},
    pages = {1--18},
    doi = {10.18637/jss.v053.i09},
  }