S. Nurdiati, M. Najib, F. Bukhari, R. Revina, and F. Salsabila, “PERFORMANCE COMPARISON OF GRADIENT-BASED CONVOLUTIONAL NEURAL NETWORK OPTIMIZERS FOR FACIAL EXPRESSION RECOGNITION”, BAREKENG: J. Math. & App., vol. 16, no. 3, pp. 927-938, Sep. 2022.