Arbain, Noor Hafizah, Jumat Salimon, Nadia Salih, and Waled Abdo Ahmed. 2022. “Optimization for Epoxidation of Malaysian Jatropha Curcas Oil Based Trimethylolpropane Ester Biolubricant”. Applied Science and Engineering Progress 15 (3):5552. https://doi.org/10.14416/j.asep.2021.10.009.