Ty, Le Van, Huynh Xuan Phu, Ha Thanh Tung, and Le Thi Chau. “Supplementation of GnRH to Superovulation in Dairy Cow Improving the Results of Embryo Production”. Academia Journal of Biology 35, no. 4 (March 19, 2014): 511–515. Accessed September 25, 2021. https://vjs.ac.vn/index.php/vjbio/article/view/3783.