Handayani, Prima Astuti, Abdullah Abdullah, and Hadiyanto Hadiyanto. 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):406-13. https://doi.org/10.3311/PPch.12965.