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2. European Copper Institute 2009 The Copper Voluntary Risk Assessment http://www.copperalliance.eu/docs/default-source/resources/copper_leaflet_vra_april_2009(for_web).pdf
3. Braun , T.B. Rawling , J. R. Richards , K. J. 1976 Factors Affecting the Quality of Electrorefined Cathode Copper International Symposium on Copper Extraction & Refining Las Vegas, Nevada
4. The Electrolyte Purification of Copper Refinery Electrolyte;Hoffmann;Journal of the Minerals, Metals & Materials Society,2004
5. Impurity Control and Removal in Copper Tankhouse Operations;Wang;Journal of Metals,2004