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Suhadi, A. , Harahap, H. , Arrosyidi, Z. , Epan, E. , Darmapala, D.. "Characterization of Candlenut Shells and Its Application to Remove Oil and Fine Solids of Produced Water in Nutshell Filters of Water Cleaning Plant". World Academy of Science, Engineering and Technology, Open Science Index 169, International Journal of Chemical and Molecular Engineering (2021), 15(1), 10 - 18.