Fontana, Roberto, and Sabrina Sampò. “Minimum-Size Mixed-Level Orthogonal Fractional Factorial Designs Generation: A SAS-Based Algorithm”. Journal of Statistical Software 53, no. 10 (May 29, 2013): 1–18. Accessed April 25, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v053i10.