1. 1. T. G. Spiro, in “Inorganic Biochemistry”, ed. G. L. Eichorn, 1973, Vol. 1, Elsevier, Amsterdam, 549.
2. 2. H. N. Frenley, in “The enzymes”, ed. P. D. Boyer, 3rd ed., 1971, Vol. 4, Academic Press, New York, 417.
3. 3. D. W. Moss, Clin. Chem., 1982, 28, 2007.
4. 4. S. Iino, Nippon Rinsho (in Japanese), 1995, 53, 1157.
5. 5. J. A. Lorente, J. Morote, C. Raventos, G. Encabo, and H. Valnzuela, J. Urol., 1996, 155, 1348.