1. Baitsch, H., u. K. G. Liebrich: Die Haptoglobintypen. Methodik ihrer Bestimmung; Allelen-Häufigkeiten in einigen Stichproben. Blut 7, 27?37, 69?96 (1961).
2. Cleve, H.: Die gruppenspezifischen Komponenten des menschlichen Serums. Heidelberg: Dr. A. Hüthig Verlag 1965.
3. Hirschfeld, J.: Immunoelektrophoresis ? Procedure and application to the study of group-specific variations in sera. Science Tools 7, 18?25 (1960).
4. Kirk, R. L., and L. Y. C. Lai: The distribution of haptoglobin and transferrin groups in South and South East Asia. Acta genet. (Basel) 11, 97?105 (1961).
5. ?, H. Cleve, and A. G. Bearn: The distribution of the group specific component (Gc) in selected populations in South and South-east Asia and Oceania. Acta genet. (Basel) 13, 140?149 (1963).