Misdawati, Misdawati, Siswadi Siswadi, and Muhammad Said Siregar. “Synthesis and Characteristics Rubber Seed Oil Bioadditive from Sumatera Utara As Low Pour Point of CPO Biodiesel”. Jurnal Pendidikan Kimia 16, no. 2 (August 29, 2024): 176–184. Accessed May 20, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/62374.