1. Baker, A.J.M., McGrath, S.P., Reeves, R.D. and Smith, J.A. (2000) Metal hyperaccumulator plants: a review of the ecology and physiology of a biochemical resource for phytoremediation of metal-polluted soils. In: Terry, N. and Bañuelos, G.S. (eds),Phytoremediation of contaminated soils and waters, pp. 85–107. Lewis Publishers, Boca Raton.
2. Bodek, I., Lyman, W.J., Reehl, W.F. and Rosenblatt, D.H. (1988)Environmental inorganic chemistry: properties, processes, and estimation methods. SETAC Spec. Publ. Ser. Pergamon Press, New York.
3. De Vries, W. and Bakker, D.J. (1998) Manual for calculating critical loads of heavy metals for terrestrial ecosystems.Guidelines for critical limits, calculation methods and input data. Report 166. DLO Winand Staring Centre, Wageningen, the Netherlands.
4. Deu, M. and Kreeb, K. H. (1993) Seasonal variations of foliar metal content in three fruit-tree species. In: Markert, B. (ed.),Plants as biomonitors: indicators for heavy metals in the terrestrial environment, pp. 577–591. VCH, Weinheim, New York.
5. Fergusson, J. E. (1990)The heavy metals, chemistry, environmental impact and health effects. Pergamon Press, Oxford.