1. P. Karlson, Kurzes Lehrbuch der Biochemie, Thieme, Stuttgart, New York 1988.
2. J. D. Rawn, Biochemistry, Neil Patterson Publishers, Burlington, N. C., USA 1989.
3. D. Szeleny and J. Sos, Arzneim.-Forsch., 21 (1991) 777.
4. M. Sabat, D. Zglinska and B. Jezowska-Trzebiatowska, Acta Cryst., B36 (1980) 1187.
5. A. Karipides and B. Thomas, Acta Cryst., C42 (1986) 1705.