Upgrading Crude Biodiesel dari Minyak Goreng Bekas menggunakan Katalis H-Zeolit. Jurnal Kimia Valensi, [S. l.], v. 5, n. 1, p. 79–86, 2019. DOI: 10.15408/jkv.v5i1.10493. Disponível em: https://journal.uinjkt.ac.id/valensi/article/view/10493. Acesso em: 26 oct. 2025.