Velásquez, A. E., J. R. Manríquez, F. O. Castro, and L. l. Rodríguez-Alvarez. 2013. “Effect of Zona Pellucida Removal on Early Development of in Vitro Produced Bovine Embryos”. Archivos De Medicina Veterinaria 45 (1):7-15. https://doi.org/10.4067/S0301-732X2013000100003.