1. W. C. Rose, The nutritive significance of the amino acids. Physiologic. Rev. 18 (1938). ?W. C. Rose undE. Rice, Science90, 186 (1940).
2. E. Fischer, Untersuchungen �ber Aminos�uren Polypeptide und Proteine, Julius Springer Berlin. 1909.
3. D.D.Dakin, Biochemic. J.12, 290 (1918);Z.physiol.Chem.130,159(1923).
4. D. D. van Slyke, Abderhaldens Handb. d. biochem. Arbeitsmethoden, Abt. I, Teil 7, S. 66.
5. W. Gra�mann undK. Riederle, Biochem. Z.284, 177 (1936).