1. Use of microorganisms for the study of drug metabolism: an update;Clark;Med Res Rev,1991
2. Oxidation of steroids;Holland;Chem Soc Rev,1982
3. Microbial transformation of, steroids;Charney,1967
4. Microbiological reactions with steroids;Smith,1974
5. Yoshioka H, Asada S, Fujita S. Process for production of 6β,14α-hydroxyandrost-4-ene-3,17-dione, European Patent 5: 99, 658.1994.