Amin, M. ., . M. . Amanullah, and . A. . Akbar. “Monitoring Yarn Count Quality Using Xbar-R and Xbar-S Control Charts: Control Chart to Monitor Yarn Count Quality”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 55, no. 1, Apr. 2021, pp. 97-107, https://ppaspk.org/index.php/PPAS-A/article/view/197.