Brock, Guy, Vasyl Pihur, Susmita Datta, and Somnath Datta. “ClValid: An R Package for Cluster Validation”. Journal of Statistical Software 25, no. 4 (March 18, 2008): 1–22. Accessed April 19, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v025i04.