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Terri Zhuan, Ean Lee and Chanida, Krongchai and Nurul Aida Lu, Bt Mohd Irwan Lu and Sila, Kittiwachana and Siong, Fong Sim (2015) Application of central composite design for optimization of the removal of humic substances using coconut copra. International Journal of Industrial Chemistry, 6 (3). pp. 185-191. ISSN 2228-5547