Oliveira, Reginaldo Luis, et al. “Proliferative Activity of Oocytes in Multi-Oocyte Follicles of Bovine Ovary”. Semina: Ciências Agrárias, vol. 38, no. 6, Nov. 2017, pp. 3591-8, doi:10.5433/1679-0359.2017v38n6p3591.