1. (a) Wong, C.-H.; Whitesides, G. M. Enzymes in Synthetic Organic Chemistry; Pergamon Press: New York, 1994; pp. 46–59.
2. (b) Faber, K. Biotransformations in Organic Chemistry, 2nd ed.; Springer-Verlag: Heidelberg, 1995; pp. 298–305.
3. (c) Jakubke, H.-D.; Kuhl, P.; Konnecke, A. Angew. Chem., Int. Ed. Engl. 1985, 24, 85–93.
4. (d) For a comprehensive Protease-Catalyzed Peptide Synthesis Database up to 1993 see: http://biont.ukc.ac.uk/bio/database/proteases/Entry.html
5. Sears, P.; Wong, C.-H. Biotechnol. Progress 1996, 12, 423–433, and references cited therein.