Zhang, Dong, and Qichuan Tian. “A Novel Fuzzy Optimized CNN-RNN Method for Facial Expression Recognition”. Elektronika ir Elektrotechnika 27, no. 5 (October 27, 2021): 67–74. Accessed January 23, 2026. https://eejournal.ktu.lt/index.php/elt/article/view/29648.