Lukas Kano Mangalla. “Enhancing the Grindability and Porosity of Palm Kernell Shell Through Microwave Preheating and Torrefaction for Sustainable Energy Production”. International Journal of Intelligent Systems and Applications in Engineering 12, no. 4 (July 23, 2024): 1957–1966. Accessed September 14, 2025. https://www.ijisae.org/index.php/IJISAE/article/view/6514.