Fritz, H., 1983. Arzneimittelforschung. 33: 479-494. PMID: 6191764
Hewlett, G. 1990. Biotechnology. 8: 565-6, 568. PMID: 1369990
Levy, J.H., et al. 2004. Orthopedics. 27: s653-s658. PMID: 15239552
Keesey, J. ed. 1987. Biochemica Information.1st Ed. Boehringer Mannheim Biochemicals. Indianapolis, IN. 1987. p. 111.