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Moses, Irekefe A. and Akingbade, Francis K. (2022) Development of A Low-Cost Portable Heartbeat Monitor Using an Infrared Sensor and a Microcontroller-Digital Stethoscope. International Journal of Electrical and Electronics Engineering Studies, 8 (1). pp. 14-36. ISSN 2056-581X (Print), 2056-581X (Print),