Nuriman, Muhammad Alifian, Michael B. C. Khoo, Sajal Saha, Zhi Lin Chong, and Shanyu Chua. 2026. “Performance of the Double Sampling Coefficient of Variation Chart under Measurement Errors Using a Linear Covariate Error Model for Monitoring NPK Fertilizer Manufacturing Process”. Journal of Quality Measurement and Analysis 22 (1):173-204. https://doi.org/10.17576/jqma.2201.2026.10.