Nevalainen, Jaakko, and Hannu Oja. “SAS/IML/Macros/for/a/Multivariate/Analysis/of/Variance/Based/on/Spatial/Signs”. Journal of Statistical Software 16, no. 5 (May 17, 2006): 1–17. Accessed April 6, 2025. https://www.jstatsoft.org/index.php/jss/article/view/v016i05.