R. Islamadina, F. Arnia, T. F. Abidin, R. Muharar, A. S. Aziz, and K. Saddami, “Deep Learning Based Pain Recognition via Facial Expression Using Feature Fusion of Visual and Thermal Images”, j.electron.electromedical.eng.med.inform, vol. 8, no. 3, pp. 1163-1183, Jul. 2026.