Sumari S, Santoso A, Asrori MR. A Review: Synthesis of Biodiesel from Low/Off Grade Crude Palm Oil on Pretreatment, Transesterification, and Characteristics. Orbital: Electron. J. Chem. 2021;13(4):385-391. Accessed January 29, 2026. https://periodicos.ufms.br/index.php/orbital/article/view/15585