1. Abraham, E. P., and G. G. F. Newton: Biochemistry of Some Peptide and Steroid Antibiotics, 30. New York: Wiley and Sons 1957.
2. — Biochem. J. 79, 377 (1961).
3. — E. Chain, C. M. Fletcher, A. D. Gardner, N. G. Heatley, A. M. Jennings, and H. W. Florey: Lancet 1941 II, 177, 189.
4. Arnstein, H. R. V., and D. Morris: Biochem. J. 76, 359 (1960).
5. —, E. J. Toms: Biochim. Biophys. Acta 35, 561 (1959).