B. V. Durga, S. B. S. Lakshmi, S. Musthafa, B. Kalesh, S. Kumar. “A Review of Convolution Neural Network, ECG and STFT Based Spectrogram for Health Applications”. International Journal of Advanced Science and Technology, Vol. 29, no. 04, Dec. 2020, pp. 11197 -06, http://sersc.org/journals/index.php/IJAST/article/view/34443.