Hutahaean, Y., D. Hapsari, and D. Rusdiyanto. “Design of a Monitoring Device and System for Measuring Heart Rate, Oxygen Saturation and Body Temperature Based on the Internet of Things (IoT)”. JTEIN: Jurnal Teknik Elektro Indonesia, Vol. 6, no. 1, Feb. 2025, pp. 1-10, doi:10.24036/jtein.v6i1.704.