Ceballos, Alejandro, Fernando German Wittwer, Pedro Alberto Contreras, Eduardo Quiroz, e Helga Lidia Bohmwald. 1999. “Blood activity of glutathione peroxidase and its correlation with blood selenium concentration in grazing dairy cattle”. Pesquisa Agropecuária Brasileira 34 (12): 2331-38. https://doi.org/10.1590/S1678-3921.pab1999.v34.5573.