Pongpullponsak*, Adisak, Wichai Suracherkiiati, and Rungsarit Intaramo. “The Comparison of Efficiency of Control Chart by Weighted Variance Method, Scaled Weighted Variance Method, Empirical Quantiles Method and Extreme-Value Theory for Skewed Populations”. CURRENT APPLIED SCIENCE AND TECHNOLOGY 6, no. 2a (March 30, 2018): 456–465. accessed September 24, 2026. https://li01.tci-thaijo.org/index.php/cast/article/view/147965.