Galimberti, Giuliano, Gabriele Soffritti, and Matteo Di Maso. “Classification Trees for Ordinal Responses in R: The RpartScore Package”. Journal of Statistical Software 47, no. 10 (May 17, 2012): 1–25. Accessed March 29, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v047i10.