Ayvaz, Uğur, Hüseyin Gürüler, and Mehmet Osman Devrim. “USE OF FACIAL EMOTION RECOGNITION IN E-LEARNING SYSTEMS”. Information Technologies and Learning Tools 60, no. 4 (September 30, 2017): 95–104. Accessed April 27, 2024. https://journal.iitta.gov.ua/index.php/itlt/article/view/1743.