Pannavira and Hermawan, A. (2026) “Multimodal Wearable-Based Stress Detection Using Machine Learning: A Systematic Review of Validation Protocols and Generalization Gaps (2021 – 2025)”, Ultimatics : Jurnal Teknik Informatika, 17(2), pp. 203–213. doi: 10.31937/ti.v17i2.4488.