Espina, R., R. Barroca, and M. L. S. Abundo. “The Optimal High Heating Value of the Torrefied Coconut Shells”. Engineering, Technology & Applied Science Research 12, no. 3 (June 6, 2022): 8605–8610. Accessed August 11, 2022. https://etasr.com/index.php/ETASR/article/view/4931.