Mota-Rojas, D., M. Alonso-Spilsbury, L. M. Novales, M. E. Trujillo, J. Valencia, R. Ramírez-Necoechea, S. Cortés, and I. E. Ibarra. “Changes of Vaginal Epithelium in Creole Pigs Ovulating During Lactation”. Brazilian Journal of Veterinary Research and Animal Science, vol. 42, no. 5, Oct. 2005, pp. 333-8, doi:10.11606/issn.1678-4456.bjvras.2005.26409.