Tongrueng, S., T. Vongpralub, W. Srimooltho, and Y. Phasuk. “Transforming Growth Factor Beta1 in Porcine Seminal Plasma on Characteristic of Sperm and Reproductive Efficiency in Sows”. Science & Technology Asia, Vol. 26, no. 1, Mar. 2021, pp. 216-23, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/225956.