1. 3) Martell, A. E., and Calvin, M. “Chemistry of the Metal Chelate Compounds”, Prentice-Hall, New York, p. 239 (1952).
2. 11) Stewart, J. J. P., MOPAC 2002, Fujitu Ltd., Tokyo, Japan (2001).
3. 12) JIS K0101, “Testing Method for Industrial Water”, Japanese Industrial Standards Committee (1979).
4. 16) Houghton, R. P. “Metal Complexes in Organic Chemistry”, Cambride University Press, London (1979).