Charrad M, Ghazzali N, Boiteau V, Niknafs A. NbClust: An R Package for Determining the Relevant Number of Clusters in a Data Set. J. Stat. Soft. [Internet]. 2014 Nov. 3 [cited 2024 Nov. 21];61(6):1-36. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v061i06