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3. European Directive 83/513/EEC of 26 September 1983 on limit values and quality objectives for cadmium discharges;Official Journal of the European Communities,1983
4. Removal of heavy metals from wastewater by membrane processes: a comparative study;Abu Qdais;Desalination,2004
5. Selective removal of heavy metal ions from aqueous solutions by diafiltration of macromolecular complexes;Strathmann;Sep. Sci. Technol.,1980