Zakwan, Aizatul Nabilla, and Radin Siti Fazlina Nazrah Hirzin. 2022. “Comparative Study on Optimization of Factors Affecting Epoxidation-Hydroxylation Reaction for The Production of Waste Cooking Oil Based-Polyol”. Scientific Research Journal 19 (2):1-22. https://doi.org/10.24191/srj.v19i2.13748.