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Fatimah, Is and Purwiandono, Gani and Sahroni, Imam and Sagadevan, Suresh and Chun-Oh, Won and Ghazali, Sheikh Ahmad Izaddin Sheikh Mohd and Doong, Ruey-an (2022) Recyclable catalyst of ZnO/SiO2 prepared from Salacca leaves ash for sustainable biodiesel conversion. South African Journal of Chemical Engineering, 40. 134 – 143. ISSN 1026-9185, DOI https://doi.org/10.1016/j.sajce.2022.02.008.