| 1 | B. YARON, R. CALVET, R. PROST (1996) soil pollution, Processes and Dynamics 313 pp. |
| 2 | BOWEN, H.J.M (1979) Environmental Chemistry of the Elements. London,Academic Press. |
| 3 | SALOMONS, W. and FORSTNER, U. (1984); Metals in the Hydrocycle. Springer |
| 4 | ADRIANO, DC (1986), Trace elements in the terrestrial environments springer,Berlin Heidelberg NewYork, 533pp. |
| 5 | B. YARON, R. CALVET, R. PROST (1996) soil pollution, Processes and Dynamics 313 pp. |