Esan, A. O., B. E. Ojo, A. A. Sobowale, N. S. Okomba, B. A. Omodunbi, and T. Adebiyi. “Facial Expression-Based Customer Sentiment Analysis for Service Quality Improvement Using Deep Learning Techniques”. LAUTECH Journal of Engineering and Technology 20, no. 2 (July 17, 2026): 40–51. Accessed July 19, 2026. https://www.laujet.com/index.php/laujet/article/view/1073.