1. Selenium and the activity of glutathione peroxidase in bovine erythrocytes;Allen;Vet. Rec.,1975
2. Reference values for a field test to estimate inadequate glutathione peroxidase activity and selenium status in the blood of cattle;Backall;Am. J. Vet. Res.,1979
3. A simple test for glutathione peroxidase and selenium deficiency;Board;Vet. Rec.,1976
4. Blood selenium concentrations and glutathione peroxidase activities in dairy herds with high and low somatic cell counts;Erskine;JAVMA (J. Am. Vet. Med. Assoc.),1987
5. Statistics for Bioscience;Ichihara,1990