Nikmah, A., A. Damayanti, and E. Winarko. “Voice-Based Emotion Identification Based on Mel Frequency Cepstral Coefficient Feature Extraction Using Self-Organized Maps and Radial Basis Function”. Contemporary Mathematics and Applications (ConMathA), vol. 7, no. 1, Mar. 2025, pp. 36-45, doi:10.20473/conmatha.v7i1.68246.