Monaci, Maurizio, Laudinor de Vuono, and Umberto Chicchini. 1990. “Protection of Bovine Monozygotic Twin by Means of Embryo Microsurgery”. Brazilian Journal of Veterinary Research and Animal Science 27 (1): 111-22. https://doi.org/10.11606/issn.0000-0000.271111-122.