KHARCHE, S D, et al. “Ovarian and Endocrine Response Following Pretreatment With Human Chorionic Gonadotrophin and Estradiol Valerate in PMSG Treated Crossbred Cows”. The Indian Journal of Animal Sciences, vol. 78, no. 5, Mar. 2011, https://epubs.icar.org.in/index.php/IJAnS/article/view/4710.