Heydari, Saeed, Mahmoud Afshari, Saeed Tahmasebi, and Ali Akbar Heydari. “A Synthetic Variable Parameter X¯bar Control Charts to Detect Small and Moderate Shifts”. Thailand Statistician 23, no. 3 (June 24, 2025): 512–522. accessed December 9, 2025. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/259923.