1. Alloway BJ (ed) (1995) Heavy metals in soils, 2nd edn. Blackee Academic & Professional, London Glasgow Weinheim New York Tokyo Melbourne Madras, p 330
2. Hutziner O (ed) (1984) The handbook of environmental chemistry, Vol 3, Part C. Anthropogenic compounds. Springer, Berlin Heidelberg New York, p 143
3. Zhou D-x, Li S-s (1982) Acta Pedologica Sinica 19: 409–411 (in Chinese)
4. Zhou D-x, Liu D-n (1985) J Environ Health 48: 14–18
5. Dagani R (1988) Chem Eng News, May 16: 24–29