W. G. Viana and V. Borelli, “Contribution to the study of the spermatic cord in bovines of Nelore breed”, Braz. J. Vet. Res. Anim. Sci., vol. 28, no. 1, pp. 11–17, Jun. 1991, doi: 10.11606/issn.1678-4456.bjvras.1991.51919.