1. Makin HLJ (1975) Biochemistry of steroid hormones. Blackwell Scientific Publications, Oxford, p 4
2. Briggs MJ, Brothern J (1970) Steroid biochemistry and pharmacology. Academic Press, London/New York, p 121
3. Makin HLJ (1975) Biochemistry of steroid hormones. Blackwell Scientific Publications, Oxford, p 70
4. Gower DB, Bicknell DC (1972) Acta Endocr 70:567
5. Makin HLJ (1975) Biochemistry of steroid hormones. Blackwell Scientific Publications, Oxford, p 77