Ultrasound-Assisted Extraction of Lignin from Oil Palm Frond. Jurnal Teknologi, [S. l.], v. 67, n. 4, 2014. DOI: 10.11113/jt.v67.2801. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/2801.. Acesso em: 23 jul. 2024.