1. BEET, E.A., E AFR MED J 23: 75 (1946).
2. BEET, E.A., E AFR MED J 24: 212 (1947).
3. CALLENDER, STE, SICKLE CELL DISEASE - STUDIED BY MEASURING THE SURVIVAL OF TRANSFUSED RED BLOOD CELLS, JOURNAL OF LABORATORY AND CLINICAL MEDICINE 34: 90 (1949).
4. DIGGS, L.W., The incidence and significance of the sickle cell trait, ANNALS OF INTERNAL MEDICINE 7: 769 (1933).
5. EMMEL, V.E., A study of the erythrocytes in a case of severe anemia with elongated and sickle-shaped red blood corpuscles, ARCHIVES OF INTERNAL MEDICINE 20: 586 (1917).