Ceballos, A.; Wittwer, F. G.; Contreras, P. A.; Quiroz, E.; Bohmwald, H. L. Blood Activity of Glutathione Peroxidase and Its Correlation With Blood Selenium Concentration in Grazing Dairy Cattle. PAB 1999, 34 (12), 2331-2338. https://doi.org/10.1590/S1678-3921.pab1999.v34.5573.