Jureerat Sumretprasong, Anone Thuangsanthia, Narong Leangcharuen, Keerati Thijae, and Sarakit Thawinprawat, “Effects of Equine Chorionic Gonadotropin on Progesterone-based Estrus Synchronization in Holstein Friesian x Brahman Recipient Cows”, Agr. Nat. Resour., vol. 44, no. 2, pp. 196–201, Apr. 2010.