Z. Udin, .-. Hendri, and M. Masrizal, “Application of Embryo Transfer Technology to Improve Fertility Using GnRH Plus Progesterone and Estradiol Combination (FTAI) of Local South Pesisir Cow in West Sumatra”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 8, no. 6, pp. 2531–2538, Dec. 2018.