Izzah, Nailul, et al. “Physiological Signals As Predictors of Mental Workload: Evaluating Single Classifier and Ensemble Learning Models”. Jurnal Optimasi Sistem Industri, vol. 22, no. 2, Dec. 2023, pp. 81-98, doi:10.25077/josi.v22.n2.p81-98.2023.