Sugihdharma, J. A., F. Bachtiar, and N. Yudistira. “Improving Frame-Based Engagement Classification in E-Learning Using EfficientNet and Normalized Loss Weighting”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), Vol. 9, no. 3, June 2025, pp. 551 -61, doi:10.29207/resti.v9i3.6161.