Haanchumpol, Thidathip, and Chatchai Sermpongpan. “Remodeling Multivariate Control Chart by Using Spatial Signed Rank for Detecting Mean Shift in Normal and Non-Normal Processes”. Thailand Statistician 21, no. 3 (June 28, 2023): 691–724. Accessed May 16, 2024. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/250074.