1. in Metal Ions in Biological Systems, Vol. 9, (Ed: ), Marcel Dekker, New York 1979, p. 77.
2. Chemistry of the Amino Acids, Vol. 3, John Wiley, New York 1961, p. 2644.
3. Direct current and differential pulse polarography of penicillamine
4. Stripping Analysis, VCH Publishers, Deerfield Beach 1985, p. 58.