1. Effects of metal toxicity on the size of the soil microbial biomass;Brookes;Journal of Soil Science,1984
2. Metal residues in soils previously treated with sewage sludge and their effects on growth and nitrogen fixation by blue-green algae;Brookes;Soil Biology & Biochemistry,1986
3. Soil microbial estimates in soils contaminated with metals;Brookes;Soil Biology & Biochemistry,1986
4. Effects of metals in sludgetreated soils on crops;Carlton-Smith,1987
5. Council Directive of 12 June 1986 on the protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture;CEC; Council of the European Communities;Official Journal of the European Communities No. L181 (86/278/EEC),1986