Isolation and Characterization of Lignin obtained from Calliandra calothyrsus shrub using FT-IR Spectroscopy. International Journal of Current Engineering and Technology, [S. l.], v. 4, n. 2, p. 542–544, 2014. Disponível em: https://ijcet.evegenis.org/index.php/ijcet/article/view/569. Acesso em: 13 apr. 2026.