1. UK sewage sludge survey: national presentation;Gendebein,1999
2. Accumulation of heavy metals in sewage sludge treated soils;Chang;J Environ Qual,1984
3. Cornu S, Neal C, Neal M, Whitehead P, Sigolo J, Vachier P. The environmental impact of heavy metals from sewage sludge in ferrasols. In: Armannsson H, editor. Geochemistry of the Earth's Surface. Proceedings of the fifth international symposium, Reykjavik, Iceland. Rotterdam, Netherlands: A.A. Balkema; 1999. p. 169–72.
4. Trace metal movement in an aeric ochraqualf following 14 years of annual sludge applications;Dowdy;J Environ Qual,1991
5. CEC (Council of the European Communities). Council Directive of 12 June 1986 on limit values and quality objectives for discharges of certain dangerous substances (86/280/EEC). Off J Eur Commun 1986;L181: 16–27.