Chia, Keat Yeng, et al. “Optimization of Microwave-Assisted Inorganic Salt Pretreatment for Production of Fermentable Sugars from Spent Coffee Ground”. International Journal of Biomass Utilization and Sustainable Energy (IJBUSE), vol. 2, Sept. 2024, doi:10.58915/ijbuse.v1.2024.1007.