Mohamad Azman, Nurul Alia, and Nasrul Fikry Che Pa. “Production of Smokeless Biofuel Briquettes from Palm Kernel Shell Assisted With Slow Pyrolysis Treatment”. Progress in Engineering Application and Technology 2, no. 1 (June 16, 2021): 38–49. Accessed June 27, 2022. https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/780.