Sumarna, Sumarna, Agus Purwanto, and Dyah Kurniawati Agustika. “FREQUENCY COMPONENT EXTRACTION OF HEARTBEAT CUES WITH SHORT TIME FOURIER TRANSFORM (STFT)”. Jurnal Sains Dasar 5, no. 1 (April 26, 2016): 1–6. Accessed June 26, 2025. https://journal.uny.ac.id/index.php/jsd/article/view/12658.