Nakakate, Panlop, Sukuman Sarikavanij, Saowanit Sukparungsee, and Yupaporn Areepong. “Improving Bivariate Ranked Set Sampling with Application to Chi-Square Control Chart”. Thailand Statistician 18, no. 2 (March 20, 2020): 108–121. accessed September 25, 2026. https://ph02.tci-thaijo.org/index.php/thaistat/article/view/240218.