1. Brown, D. S. and Allison, J. D. 1990. MINTEQA2: A geo-chemical assessment model for environmental system. Version 3.0 User’s Manual. EPA, Athens, Georgia.
2. Kragten, J. 1978. Atlas of metal-ligand equilibrium in aqueous solution, Chichester, Horwood.
3. Martell, A. E. and Smith, R. M. 1979.Critical Stability Constants, Vol 1–5. Plenum Press, New York.