Rao, Gadde Srinivasa, Muhammad Aslam, Muhammad Azam, and Chi-Hyuck Jun. “A Control Chart Based on Two-Piece Normal Distribution Using Repetitive Sampling”. Pakistan Journal of Statistics and Operation Research 14, no. 4 (December 25, 2018): 961-973. Accessed February 12, 2025. https://pjsor.com/pjsor/article/view/1561.