Haanchumpol, Thidathip, and Chatchai Sermpongpan. 2023. “Remodeling Multivariate Control Chart by Using Spatial Signed Rank for Detecting Mean Shift in Normal and Non-Normal Processes”. Thailand Statistician 21 (3):691-724. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/250074.