Sangnawakij, P. (2022) “Regression-in-Ratio Estimator and Confidence Interval for the Population Mean for Data with Outliers”, Science & Technology Asia, 27(2), pp. 42–57. available at: https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/246818 (accessed: 26 August 2026).