Pattarapanitchai, P. ., K. . Budsaba, T. . Loc Hung, and A. . Volodin. “On the Normal Approximation for Some Special Estimators of the Ratio of Binomial Proportions”. Thailand Statistician, vol. 20, no. 4, Sept. 2022, pp. 779-90, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/247460.