Triyani, Yuli, et al. “Computer Aided Diagnosis (CAD) Untuk Phonocardiogram (PCG) Berbasis Fast Fourier Tranform ”. Jurnal Elektro Dan Mesin Terapan, vol. 7, no. 1, Nov. 2021, pp. 66-75, doi:10.35143/elementer.v7i1.4454.