Hashim, Norazlina, Marsita Abd Ghani, Muhammad Fauzan Emran, and Mohd BadrulHaswan Besar. 2022. “Synthesizing the Biochar from Gelam Tree Leaves by Pyrolysis Method”. International Journal of Synergy in Engineering and Technology 3 (2), 143-49. https://ijset.tatiuc.edu.my/index.php/ijset/article/view/134.