Zanetti, Marcos Antonio, and Rodolfo Luiz Pettinati. “Selenium Balance in Sheep With and Without Supplementation of Sodium Selenite”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 4, Apr. 1991, pp. 455-60, doi:10.1590/S1678-3921.pab1991.v26.3362.