National Institute of Environmental Research;National Institute of Environmental Research;National Institute of Environmental Research;National Institute of Environmental Research;National Institute of Environmental Research;National Institute of Environmental Research;National Institute of Environmental Research;
10. Bradford, G.R., Chang, A.C., Page, A.L., Bakhtar, D., Frampton, J.A., and Wright, H., 1996, Background Concentrations of Trace and Major Elements in Califonia Soils, Kearney Foundation of Soil Science Division of Agriculture and Natural Resources University of Califonia, Kearney Foundation Special Report, p. 24-28
11. Ferguson, C., Darmendrail, D., Freier, K., Jensn, B.K., Jensen, J., Kasamas, H., Urzelai, A. and Veter, J. (editers), 1998, Risk Assessment for Contaminated Sites in Europe. Vol. 1 Scientific Basis, LQM Press, Nottingham
12. Kabata-Pendias, A., Pendias, H., 2001, Trace Elements in Soils and Plants, CRC Press, Boca Raton, Fla