APA

Hardell L., Danell M., Angqvist C. A., Marklund S. L., Fredriksson M., Zakari A. L. & Kjellgren A. (19930423). Levels of selenium in plasma and glutathione peroxidase in erythrocytes and the risk of breast cancer. A case-control study. : Biological trace element research.

Chicago

Hardell L, Danell M, Angqvist C A, Marklund S L, Fredriksson M, Zakari A L and Kjellgren A. 19930423. Levels of selenium in plasma and glutathione peroxidase in erythrocytes and the risk of breast cancer. A case-control study. : Biological trace element research.

Harvard

Hardell L., Danell M., Angqvist C. A., Marklund S. L., Fredriksson M., Zakari A. L. and Kjellgren A. (19930423). Levels of selenium in plasma and glutathione peroxidase in erythrocytes and the risk of breast cancer. A case-control study. : Biological trace element research.

MLA

Hardell L, Danell M, Angqvist C A, Marklund S L, Fredriksson M, Zakari A L and Kjellgren A. Levels of selenium in plasma and glutathione peroxidase in erythrocytes and the risk of breast cancer. A case-control study. : Biological trace element research. 19930423.