Raharjo, Sapto, et al. “The Effect of Microwave Charcoal Activation on the Calorific Value and Burning Rate of Palm Kernel Shell Charcoal Briquettes”. Edelweiss Applied Science and Technology, vol. 9, no. 6, June 2025, pp. 2660-8, doi:10.55214/25768484.v9i6.8461.