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B. Guezzen and  M.A. Didi and  B. Medjahed,  Optimization of Process Parameters using Response Surface Methodology for the Removal of Zinc(II) by Solvent Extraction .   journal   = {International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology. February 2017, vol. 122(2). 126 - 129[viewed 22 May 2018]. Available from: http://waset.org/publications/10006195.