Ty, Le Van, Huynh Xuan Phu, Ha Thanh Tung, and Le Thi Chau. 2014. “Supplementation of GnRH to Superovulation in Dairy Cow Improving the Results of Embryo Production”. Academia Journal of Biology 35 (4):511-15. https://doi.org/10.15625/0866-7160/v35n4.3783.