Zanella, Ricardo, et al. “Testicular Characteristics of Bulls Immunosterilized With Anti-Luteinizing Hormone-Releasing Hormone Vaccine”. Pesquisa Agropecuaria Brasileira, vol. 44, no. 10, Dec. 2010, pp. 1359-63, doi:10.1590/S1678-3921.pab2009.v44.2091.