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Handayani, P., Abdullah, A. and Hadiyanto, H. 2019. Response Surface Optimization of Biodiesel Production from Nyamplung (Calophyllum inophyllum) Oil Enhanced by Microwave and Ionic liquid + NaOH Catalyst. Periodica Polytechnica Chemical Engineering. 63, 3 (2019), 406-413. DOI: https://doi.org/10.3311/PPch.12965.