Dr.P.K.Sivakumaran, and Mrs.T. Kanneswari. “Control Chart Based On Six Sigma For Range With Robust Scale Estimator”. Journal of Computational Analysis and Applications (JoCAAA) 33, no. 08 (September 9, 2024): 72–81. Accessed December 21, 2024. https://eudoxuspress.com/index.php/pub/article/view/1237.