Dino, Hivi I., and Maiwan B. Abdulrazzaq. “A Comparison of Four Classification Algorithms for Facial Expression Recognition”. Polytechnic Journal 10, no. 1 (June 30, 2020): 74-80. Accessed May 5, 2024. https://journals.epu.edu.iq/index.php/polytechnic/article/view/137.