Viana, Carlos Henrique Cabral, Rubens Paes de Arruda, Anibal Saint'Anna Moretti, and José Antonio Visintin. 1998. “Ovarian Cysts, Rectal Palpation and Ultra-Rectal Ultra- Sonography Diagnosis in Sows: Literature Review and Two Clinical Report Studies”. Brazilian Journal of Veterinary Research and Animal Science 35 (2): 64-68. https://doi.org/10.1590/S1413-95961998000200003.