Wehrens, Ron, and Lutgarde M. C. Buydens. “Self- and Super-Organizing Maps in R: The Kohonen Package”. Journal of Statistical Software 21, no. 5 (October 8, 2007): 1–19. Accessed November 21, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v021i05.