F. O. Robu, S. Moldovanu, and I. D. Moldovanu, “Multi-class emotion classification through visual content analysis using deep learning techniques”, Syst. Theor. Control Comput. J., vol. 5, no. 1, pp. 14–19, Dec. 2025, doi: 10.52846/stccj.2025.5.1.65.