“Effect of Heparin on the Capacitation of Frozen – Thawed Bull Sperm Used in the In-Vitro Fertilization of Oocytes Matured In-Vitro”. International Journal of Pharmacy and Life Sciences, vol. 4, no. 2, Feb. 2013, pp. 2368-70, http://ijplsjournal.com/index.php/ijpls/article/view/712.