Zakwan, A. N. ., & Nazrah Hirzin, R. S. F. . (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