1. Loewe, S., F. Lange u.E. Spohr: Biochem. Z.180, 1 (1927).
2. Bradbury, R. B., u.D. E. White: Vitam. and Horm.12, 65 (1954).
3. Butenandt, A., u.H. Jacobi: Hoppe Seyler's Z. physiol. Chem.218, 104 (1933).
4. Schoeller, W., u.H. Goebel. Biochem. Z.278, 298 (1935).
5. Harder, R.: Abh. Ges. Wiss. Göttingen, Math.-Phys. Kl., III. F. H.18, 41 (1937).