Simpson RJ, Cooper CE, Raja KB, Halliwell B, Evans PJ, Arouma OI, Singh S, Konijn AM. Non-transferrin-bound iron species in the serum of hypotransferrinaemic mice. Biochimica et Biophysica Acta (BBA) - General Subjects. 1992 Dec;1156(1):19–26. doi: 10.1016/0304-4165(92)90090-h.