Ritzkal, R. ., B. Adhi Prakosa2, and R. Juhar Maulana. “Human Heart Rate Detection With Web Monitoring: ”. Jurnal Mantik, vol. 5, no. 3, Nov. 2021, pp. 1676-83, https://www.ejournal.iocscience.org/index.php/mantik/article/view/1694.