Lawal, A. A., M. A. Hassan, B. Mohammed, and Y. Shirai. “Effect of Oil Palm Biomass Cellulosic Content on Molecular Structure of Biochar”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 21, no. 2, June 2025, pp. 646-55, https://www.azojete.com.ng/index.php/azojete/article/view/1086.