Wen, Tee Yi, Nurul Aini Bani, Firdaus Muhammad-Sukki, and Siti Armiza Mohd Aris. 2020. “Electroencephalogram (EEG) Human Stress Level Classification Based on Theta Beta Ratio”. International Journal of Integrated Engineering 12 (6): 174-80. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/6598.