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Hasanudin and Asri, Wan Ryan and Muthiarani, Tri Eltiyah and Bahrain, David and Hadiah, Fitri (2022) Esterification of free fatty acid from sludge palm oil using zeolite- sulfonated carbon from sugar cane catalysts. Journal of Oil Palm Research (Malaysia), 35. pp. 268-280. ISSN 2811-4701