Thu, D. V., Binh, D. V., Ty, L. V., Hue, L. T. and Khoi, T. D. (2013) “Application of estrus synchronization for artificial insemination to improve productivity and quality of beef cattle”, Academia Journal of Biology, 35(1), pp. 110–115. doi: 10.15625/0866-7160/v35n1.2946.