Thioulouse, Jean, and Stéphane Dray. “Interactive Multivariate Data Analysis in R With the Ade4 and ade4TkGUI Packages”. Journal of Statistical Software 22, no. 5 (September 2, 2007): 1–14. Accessed May 3, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v022i05.