Almeida, J. M. de, R. M. B. Santos, M. A. Miglino, and L. de Morais-Pinto. “Morphology of the "funiculus umbilicalis" In Wooless Mongrel Sheep (Ovis Aries, L. 1758)”. Brazilian Journal of Veterinary Research and Animal Science, vol. 37, no. 3, Jan. 2000, pp. 189-93, doi:10.1590/S1413-95962000000300003.