1. E. I. Chazov, Med. Gazeta, No. 40, 9 (1996).
2. L. H. Opie, Scientific American Sci. & Med., No. 4, 15 (1994).
3. V. M. L'vov and L. Ya. Yukel'son, Khim. Prir. Soedin., 435 (1995).
4. O. A. Kost, N. A. Lamzina, and N. F. Kazanskaya, Biokhimiya,55, No. 6, 974 (1990).
5. B. Holmquist, P. Bunning, and J. F. Riordan, Anal. Biochem.,95, 540 (1979).