1. R. I. Dorfman andF. Ungar,Metabolism of Steroid Hormones (Minneapolis, 1953), p. 34.
2. D. H. Peterson, Research6, 309 (1953).
3. D. H. Peterson in:S. A. Waksman,Perspectives and Horizons in Microbiology (New Brunswick, N. J., 1955), p. 121.
4. K. Florey, Chimia8, 81 (1954).
5. C. A. Finch, Manufact. Chemist25, 247, 548 (1954);26, 120 (1955).