A. Riyuska, N. W. K. Karja, and A. Setiadi, “Efficacy of Leptin Supplementation on Nuclear Maturation and Fertilization Rate of Sheep Oocytes In Vitro”, Trop. Anim. Sci. J., vol. 42, no. 1, pp. 1–5, Mar. 2019, doi: 10.5398/tasj.2019.42.1.1.