Sabar, Setiawidayat, et al. “Detection of Amplitude Peak and Duration of QRS Electrocardiogram Waves Using Discrete Data: Deteksi Puncak Amplitudo Dan Durasi Gelombang QRS Elektrokardiogram Menggunakan Discrete Data”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), vol. 4, no. 3, June 2020, pp. 438-46, https://doi.org/10.29207/resti.v4i3.1658.