Raweesawat, K., Y. Areepong, S. Sukparungsee, and K. Jampachaisri. “Odds Ratio Estimation in Rare Data by Empirical Bayes Method”. Thailand Statistician, vol. 15, no. 2, July 2017, pp. 149-56, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/92198.