Wickham, Hadley, Dianne Cook, Heike Hofmann, and Andreas Buja. “Tourr: An R Package for Exploring Multivariate Data With Projections”. Journal of Statistical Software 40, no. 2 (April 7, 2011): 1–18. Accessed September 30, 2022. https://www.jstatsoft.org/index.php/jss/article/view/v040i02.