Hasnain, Syed Absar, Mohammad Siddique, Ghulamullah Khan, Azhar Abass, and Abdulhalim Musa Abubakar. “Greener Pretreatment and the Characterization of Neem and Babul Tree Barks for Lignin Extraction”. International Journal of Sustainable Energy and Environmental Research 14, no. 2 (December 1, 2025): 90–103. Accessed December 16, 2025. https://www.archive.conscientiabeam.com/index.php/13/article/view/4555.