Greener pretreatment and the characterization of neem and babul tree barks for lignin extraction . International Journal of Sustainable Energy and Environmental Research, [S. l.], v. 14, n. 2, p. 90–103, 2025. DOI: 10.18488/13.v14i2.4555. Disponível em: https://archive.conscientiabeam.com/index.php/13/article/view/4555. Acesso em: 14 sep. 2026.