Ali, H., M. Hariharan, H. Mansor, S. Adenan, M. Elshaikh, and K. Wan. “Facial Emotion Recognition Based on Empirical Mode Decomposition and Discrete Wavelet Transform Analysis”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 10, no. 1-13, May 2018, pp. 37-41, https://jtec.utem.edu.my/jtec/article/view/4119.